Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e230c611f7435c…

MALICIOUS

PDF

90.1 KB Created: 2021-08-10 02:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3393c6ada591a9ef6da64d93f4fcb78e SHA-1: f858df79fed3b132c8dbe7d02eb8ae4bf61c654b SHA-256: e9e230c611f7435c08ed566c07dac723001404b3920f0c7c9294d67b21b1aaf5
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple links to compromised WordPress sites and prompts the user to call a phone number or provide a one-time code, consistent with credential harvesting or callback phishing schemes. No scripts were extracted, but the embedded URLs suggest a pattern of distributing malicious content via compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/geiia3pefiisstv6nbh9jqeof1/rekezudutamiwo.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f1aef5d2---waxaduzod.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/iu983eekiuc9rg1i0t9ej0f0t6/delikozu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b756dce2f1e2d5367804c74562aaff60/xajatunixutakosimipumuli.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/47571065218.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e731e8ba2158bf2b9542d6aa1d057ee0/29866458332.pdfIn PDF document text
    • https://noddy.nu/images/file/bovudodosixivurirot.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/77fb002dc3f6508b71826ee4034d5630/11950376058.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/sametuxon.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9568cd825---72017928116.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3071a7f97---nilok.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/31697361227.pdfIn PDF document text
    • http://seamacros.com/upload/file/1224591530.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lujerifafa.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/wajosawipuxujopuxo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609449092f14b---34523313309.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/65722088231.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13967b6632---mijusezutepepik.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094423b06eb5---xifubo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9574067ef80a9964558ba1e2ba0d2e3d/zupide.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/57198c5d42b064ab0bdf19957928a3ce/detediruli.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/67350120503.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbeec057b0---bamojesi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/xubukogunilegewo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/54845928034.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/55230116920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nokia+phone+master+security+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 18320 bytes
SHA-256: 66ef0c615d6344e108abb2423e66d3ce53e11352ca3f04295493ef8f36c39ea4
font_01_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 11016 bytes
SHA-256: 433836f56cd1732d89ed137434b302819499ecb4eabd2f20cca014a4d1700a07

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