Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa0bb4af27450b7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 08:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa988a1b14e70f1963c7df7f1e07cc0d SHA-1: 5655a8349999f432595ed555641c7240f1009fc0 SHA-256: 9fa0bb4af27450b73843a989f0a38f1c056d380c4bd0ae0e1971861dd81a7cdd
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a social engineering lure designed to prompt the user to install a browser extension or update. Several heuristics indicate the PDF contains a link farm pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of embedded URLs and the 'browser extension installation lure' heuristic strongly suggest the document's purpose is to redirect the user to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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 http://tecs4.com/intranet/ckfinder/userfiles/files/mogekimebekubukivabov.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614283ebb0569---fifox.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea0e2dd745e736343d28e5538151c349/sulagusuludu.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/64678930100.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/wezonupegexizinoro.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/89963313284.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/bapefafeponafobe.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/kekofalul.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/supovesajijubozilixux.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/geluxase.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/60895828267.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kitenimeluvinawup.pdfIn PDF document text
    • http://ropesadventure.com/d/files/vakudipafefuzegezitagil.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/48273255909.pdfIn PDF document text
    • https://arendic.cl/files/wopizib.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/89267847733.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/3596584349.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/forevuv.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906060247.pdfIn PDF document text
    • https://renewone.de/files/60185734916.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/9803235477.pdfIn PDF document text
    • https://phunhai.net/upload/files/tazuze.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced93cab0f---93186631531.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/40696771787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+swap+android+to+iphonePDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 17044 bytes
SHA-256: 06d6c1d9ae9f49fef8fbcd1939ef0e6a4e73b5c8f6928ef95fed8fb393d8cbc2
font_01_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 10520 bytes
SHA-256: 156f7ba43b7c025ef960a6a226316461591635827cd3338bd39c78e1e60acb40

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