Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e17ad6fb04e626…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 21:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83c67bf0925a659fdf889eaa2733f1af SHA-1: c88149bd322abf8d1c6d039b0eb773d70f1b33aa SHA-256: b2e17ad6fb04e6262e9da61997dc2ff3f4e28ec1a49ac0675a463b8c13fa467e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs pointing to PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics suggest a tactic of using link farms on potentially compromised or disposable hosting to obscure the final malicious destination. The 'SE_LOLBIN_RUN_COMMAND' heuristic also points to suspicious command-like sequences within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=win+iphone+xr+free PDF link annotation
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/wapazubimojiwatunap.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/91203031070.pdfIn PDF document text
    • http://arsvet.ru/img/upload/369399189.pdfIn PDF document text
    • http://balalajka.nu/media/zademofoxunisapenijolevoj.pdfIn PDF document text
    • http://taigesw.com/upload/files/vimamusasivizoxibilikiv.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/goxumobuzavane.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0b4be3e---8303829873.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/9621050928.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/63010254868.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pojerotutekipedo.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/73062375559.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138175b377f6---99314996487.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/76342590760.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/11881471097.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/rilimepimeseme.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/17477487363.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/72659188112.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/rukikoxidasuwefoz.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/11420830488.pdfIn macro / runtime command snippet
    • http://decorstore.eu/upload/file/lojuronokekagadodowukawut.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/gajoxowugozuxuzosipogal.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161390750ba726---13670082829.pdfIn PDF document text
    • http://tverzhilservis.rIn macro / runtime command snippet
    • 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 18796 bytes
SHA-256: 4583a25db514c6f83fda638917732cc536a4673e9483f52f306f07833a9a04dc
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10076 bytes
SHA-256: e496b33e7c88138a41d5a5cdb8a49c684b524730bad9845741fb5b4fe09c40cd

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