Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d76c7ed013a25f0…

MALICIOUS

PDF

73.2 KB Created: 2021-07-08 17:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ed2b340aa518e8ba2b390e630f490df SHA-1: 2445b6c0771dae9bbb6731b1c7a8d178b7cf083b SHA-256: 5d76c7ed013a25f00b584425c33a6af9763d4f16a9d77a92d3f698e8d5892bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm that redirects to multiple compromised WordPress sites. These sites, in turn, host further PDF files or redirect to external URLs, suggesting a multi-stage redirection chain designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=sonic+colors+ds+rom+download PDF link annotation
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/pq270fvggmo21e1mn8aljvlmr5/77762774496.pdfIn PDF document text
    • https://totounited.com/contents//files/75236188987.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feab6caff1---bevaguw.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd92c070c---xikotumuxugexas.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/75765583086.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0bbabf1aeee1a7aaf5b94df2f34701e2/7232992714.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lewofonepuwisafepexoro.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1e611eab26606ecbd179fe6b0cb2f733/10356238090.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda4f20eb89---fugirukejemaridinudi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5033092c56---87255226576.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/72209526759.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bfedb9ad---9308039157.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2up4leqfq1mlrpui1jr1mvb6lf/63911286672.pdfIn PDF document text
    • http://nkland.org/userfiles/files/balubajefirazagin.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/58647116631.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070565b61896---14896490716.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70089870600.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce68682897---11176164027.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zonesovok.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/78740dd23779fcf9379d28e8648edb62/564124084.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/85327018568.pdfIn PDF document text
    • http://asustainable.com/global/file/93097725491.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/26935447523.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/denuxojareli.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_off0000be78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE78 10464 bytes
SHA-256: e29e7ca42ee4056390df367572ba4bc7cb3ed686344a975309bff10976924327
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 15992 bytes
SHA-256: 60f290c06f6177879b5fb2b836b194ec22e326224521c71625a94e0dfae18682

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