Malicious PDF — malware analysis report

Static analysis result for SHA-256 b388016e5cbd8721…

MALICIOUS

PDF

78.5 KB Created: 2021-09-24 04:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3245c3ee62d0ad36849ed7b8f55ab64e SHA-1: 700f5906d46c9e27c6a7b8670102d84f5de642d7 SHA-256: b388016e5cbd8721ad4b4ea7432228f9ab85b418589564f5459076cb49052748
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of a 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=chamber+of+secrets+online+free PDF link annotation
    • http://heninrealty.com/userfiles/files/nunibima.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca74b7cec---60807185745.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219211831344545.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/37251372774.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/4174808291.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/79742322469.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614b44edbf3f9.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gotukomam.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/talejufufu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/netokiv.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xamaparixexixe.pdfIn PDF document text
    • http://air-con.ru/upload/files/63411340416.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kinobirebateku.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/31286812161.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wituropijulajume.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kepk9n60l53hurf199ierma85e/64475942238.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/20912929618.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/3214025330.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/46862322811.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/30828451671.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613483320d7a3---12652739841.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/32875391522.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e0b744e7---35409495531.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/99245964834.pdfIn PDF document text
    • 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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 18676 bytes
SHA-256: ba260787f37e6e1a2d4be510a67d08f7594b202a5817b7bc9cf1803248eb141d
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 10772 bytes
SHA-256: ad28b6d53877068ba9af83126582ace12cbb0e81d76fad32201da23068687676

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