Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7774b29f75933c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 02:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c30906afe87f8095fdd3f60be034b2e7 SHA-1: 183bf987cf7d1d7b5f3aca763b70cb92db940f1e SHA-256: fb7774b29f75933caef196e0e8b49fad2ae9a8766256f73edc30e62fcaeceeef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609441ff3a12b---fukodal.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9701eca0be60e4c97edfcc081c443a16/3722951656.pdf
    • http://upbfassadenbau.com/upload/file/78405132283.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69928c3117---29852762713.pdf
    • https://gyandeepjkss.org/userfiles/file/vokigotozut.pdf
    • https://aimara-bg.com/userfiles/file/segalenoxinikalogelegi.pdf
    • https://kede.org/userfiles/file/dosenovoxag.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b876f1f430---joxaxuku.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64590cec7b---90214886629.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb242f0c283---ruvodolizinolizawe.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/isa4l76bqd3ohivth25dkrcjj5/bojubezife.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5ab544378f7c933da2c8a7478e257c2e/45888716472.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/31125837508.pdf
    • http://tajesink.com/Uploadfiles/files/62435045416.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987ffde1b3a---wivabetibef.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3154d5332---zavepok.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9078527368.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0va3fqi4fl41p773lme19gdlam/xewujakojitin.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8ac74d24---mukuvezud.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1b99af7d1254580e3ca0db6f748bd7bc/75106718340.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=super+dark+times+explained
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
font_01_sfnt_off000101f4.bin
c9ac412552ca98cfc195e1ca3bd3481b61e57b973cd02a3d91e9e16b5d6bc361
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10800 bytes
font_02_sfnt_off00011ad0.bin
1eb796d99ea3b3e5e9bb89d930fd52ee453d60b8e414c07dc01a2926ca1bb93d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 17456 bytes