Malicious PDF — malware analysis report

Static analysis result for SHA-256 10948cba0160a095…

MALICIOUS

PDF

92.6 KB Created: 2021-06-30 05:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdb0c121607abe50355b7c7af84b41a8 SHA-1: 6f06d36ace9a547a925842f42cad7dfedd462d86 SHA-256: 10948cba0160a0956dc15ce5bd9c74b6cdbd27abaaebfe1f151dd97b7316bcf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these link farms is a strong indicator of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://amon-syotengai.com/userfiles/file/guxibizexuvutafodivomisaw.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d5c976d0---zowuveleda.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9243a29be---nixugaj.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/588fef2fd8c0e88baf524f48a8c3702f/12422802463.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe6759e55---90159889851.pdf
    • http://bydnjl.com/userfiles/files/55797738187.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r8nhm4j128387er9krptu4i9c6/zugazikezujope.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/gipajixabezanasevopigipar.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e86af919---99171932741.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vp5hg3ioro2firk94ef300vblf/47477686259.pdf
    • http://www.aadhar-interior.com/userfiles/file/94046788319.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/86b772eb9b56f4a05bdee8da305b7817/8682090310.pdf
    • https://baobihungphu.com/media/ftp/file/55766961067.pdf
    • https://nguyenthelong.net/userfiles/files/39713770288.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b61107865013660440b4cf96b9211ca5/10457206746.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/relazikefiroxi.pdf
    • http://silesiacapital.eu/data/file/bigaxo.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/31a4e3abcfce300ca043ac6563d0de6b/41036669987.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6742a4aebc61eaf7d21893693abb99a5/rebarezekepitoz.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q67uo8qaeurpa4v0fh8gd8p1r3/nubiwudaxewip.pdf
    • https://larioenergy.net/uploads/file/55501039179.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6852812983---sizaregafedisarotoje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=example+of+notes+and+rest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 16792 bytes
font_01_sfnt_off0001040b.bin
bab71213c20bc8938f11a9041637070d85234525a678627c02d77fa2c6bd84e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10652 bytes
font_02_sfnt_off00011c6e.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 16376 bytes
font_03_sfnt_off00013292.bin
aed890610dadf1190626a026fa95418c181ecdc8880197f9213a164ab8894280
pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 19668 bytes