Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f43bb819129066…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 08:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ac7f80aa84b030aff3f0515d6ad8557 SHA-1: 4e50a90753a6ea2710ccf5d3e5bbf64578701709 SHA-256: c9f43bb819129066318cfc4fb0cfaf643d4adf47411079e140f3255bef25e0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://school15-tyumen.ru/f/82125507634.pdf In PDF document text
    • http://hunting.kg/userfiles/file/87158656973.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/lemarebisofuxugan.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xizakovuvinidawokewata.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/gogibemofupotor.pdfIn PDF document text
    • http://maidichike.com/upload/files/66278882929.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee49096667c---39457915506.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040552216850.pdfIn PDF document text
    • http://ned.ru/uploads/files/fesobidenizu.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/pisidupavorogomalibonibe.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/9c9209f7880357f526a3e5f873d21831/35070258040.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2097848f58957b02307e1748a506a839/98271036915.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/11408752486.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/76943251576.pdfIn PDF document text
    • https://tpk-m.ru/files/file/vijolakumobaxelunokufibow.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/80705337403.pdfIn PDF document text
    • https://emmaushuis.org/pages/73525640030.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c0713dfd---fejumebozoru.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084b089052c9---famibugixe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d662d1e019ba131cb79b3d8737c5f236/77827624088.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcff63186---24736509223.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/97031250544.pdfIn PDF document text
    • http://cmtsport.com/pliki/37094160716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=glencoe+health+chapter+26+pdfPDF 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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 10784 bytes
SHA-256: 2d40a9ad5919f95453df7b97f133266aba9b29ff5778c1f8053f264220e58df9
font_01_sfnt_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 16012 bytes
SHA-256: df44638e807224081d5b77e5367aae14f7886e82e7dd1c4e4630641ff8ba72c5
font_02_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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