Malicious PDF — malware analysis report

Static analysis result for SHA-256 292f87c4f17c7889…

MALICIOUS

PDF

78.5 KB Created: 2021-07-05 09:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d6710e1da1de1e59b8741c358b7d65 SHA-1: 782bd702d5bf61161fffc007f3aaf1ea1073d2c0 SHA-256: 292f87c4f17c7889a59f31410eece844467620935d7537a61c128deaddb1c1db
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The presence of multiple external URIs and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d600089cd08---simuxobadap.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/90fe35db1cc1d0f4078c7caab99eaa67/gipojinobalixibegimepid.pdf
    • http://humanitool.ru/userfiles/file/lowekadafezijon.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ggsnv0becjo16n9g49jf1ipe9b/33191608282.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/04923bvmle3mtc4po45guek3o1/kuvojomadeliwuduvoz.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a429730a69b---1540714283.pdf
    • https://cambodiadriverservice.com/userfiles/file/68058647530.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/907a501c3b20e1b2e20c18ed3475bcbf/12877599454.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e431d94aa7---mifatikopab.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebd287cae---nexafikadatelu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/6dbrhpe2g3pg7vp3sm7a6d6753/12646470110.pdf
    • http://libron.pl/fckupload/assets/file/33594848790.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a9576c94f4fe86bc64646c96f3257b70/40386148371.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qcgc5a3gldif7fosh6j4dkhpb8/93907653053.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc84eb83e---98572767849.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/37884434130.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/37de2c9f104d6f44d3cb52343d633089/vibiwubovawodefapo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07a72d984---solizozudinoratulorof.pdf
    • http://asijskepotraviny.cz/files/file/321370396.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbbb55c072---vesukil.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/03edd73971d023106e190a256ab5b83d/powurawarologapuvuperoj.pdf
    • https://vildmarksjagt.dk/userfiles/file/ridodeji.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/netelonisomajizesedojok.pdf
    • http://owv-sad.de/userfiles/files/63328504560.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1be466658c6a95f7efeed8662beae69b/84740397459.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=triangle+proofs+cpctc
    • 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_off0000cc51.bin
efbbdbd2d2bcce44789ece96088f2c091b06ee8a956550a532a749af981bbd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 17572 bytes
font_01_sfnt_off0000fad3.bin
8106e629393ea4742eed8dbd3698d9ba7f098db07fd31cfa60a9204798ee06ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10620 bytes
font_02_sfnt_off00011334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 16792 bytes

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