Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ae20712758846b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 10:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49d40b7f577d23cd5dc3f16930defd82 SHA-1: a4ca3bc51069fff032fb71413e58743151c68cb7 SHA-256: f8ae20712758846b5db20288fb9bc78245d1c9901643f17089a0199501aa0b3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The links are designed to appear as file downloads, potentially luring users to download malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6975

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=apex+launcher+7.0 PDF link annotation
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcc7bdb27---vekewaroje.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b467ce6c4---15688747164.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/67779323483.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xinosemutamo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c23393c227---32316119564.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/rekari.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/80065220890.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/44657566270.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/numadekoxazaverarokewabiw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24e1b9078---gexepikuxazaxide.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/44330518473.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ae5e551a5bf81eb83ef5ebcc1537c38/29721696920.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/95860043050.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148fe537d893---mitapetuzikuba.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210911013230.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e576690ea---83847970764.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/81281757098.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/19538791313.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/99355562589.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 10416 bytes
SHA-256: 346f32f8bd5f437607a517c8640d5b95d6f6ef62ca7f526ba7a83f5373db5c1f
font_01_sfnt_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 19828 bytes
SHA-256: 617ba8d566ec2139d34cfda88ee6ced4a5d19780b2542dbe31b07977238b725f

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