Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0affaf4b4568f1a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 10:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29b56e5911d303d6666c0629ccfc47a6 SHA-1: c17024f36ba6f27d67d7a2ae43cd60c9731b386d SHA-256: c0affaf4b4568f1a89adf8d57112e8d29fbd831058b84a5344341f30488c449b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161423da5c0d97---nijumesasuretivovixumidip.pdf In PDF document text
    • https://icoachyou.biz/images/ckeditor/files/16273999919.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161397e2768736---voralajusamani.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/pilow.pdfIn PDF document text
    • http://z500.si/files/11059637553.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/43531809392.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/15b8f58fd46c99d8ad2fd89e65efb415/49411793109.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80337193164.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/pitazi.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/wazexesaguxonorobajak.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/robetuxogusolazepadod.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/43177638678.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/25192142385.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lisawonise.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/86645c9ef4a6a36a1c52a15e29e86138/nizopinufuzumukepunekeka.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/17701871102.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/timedaduselosubefafomisez.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52630801484.pdfIn PDF document text
    • http://vinmexindia.com/uploads/dekatutidivaluwumonuxel.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vemuxixegi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/71316241886.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210909200428.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zediw.pdfIn PDF document text
    • http://dominant.name/userfiles/file/gogumirefuraloxis.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/kifaxukesudog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gba+emulator+ios+gamesPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/40549426188.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_off0000b6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 10624 bytes
SHA-256: 081bf3a728b4525d37917b2cc2a603a401ef65b4961ff82989bb62b235d147d0
font_02_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 15084 bytes
SHA-256: 2b9f2faf798543d7359b517f0fd1f55f852b26f6bb6d193e36e6ccba24229922

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