Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8caaf8d2e9ff04d…

MALICIOUS

PDF

82.5 KB Created: 2021-07-18 13:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a80c1d8d67af48b531f4445cf22ba04 SHA-1: bd6b768821c0b3e10317628b6e2feca77a586e31 SHA-256: f8caaf8d2e9ff04d39e85fb46a4f9c6199666417b65d5f0d7c3805a50508e60b
244 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam and a payment redirection lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The document body is heavily obfuscated, but the heuristics indicate a likely phishing attempt related to bank accounts and urgency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c940f2ae041de13e6a69e71973566f2/tedetisudedetenijofonize.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/11596677623.pdf
    • https://alexandrapanayotou.com/web/images/static/file/mudomirosedul.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091c69638795---8675086396.pdf
    • https://maxflowfans.com/userfiles/file/weforazakivewu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7889590---65198059049.pdf
    • https://alshaabcoop.com/userfiles/file/83921067246.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8427ac64c96f4db2fd4f3957bcdde505/49447216415.pdf
    • http://forglass.sk/userfiles/file/muxokesivigekapajil.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7a041b5c15b710da2c0a861724eda873/57178245862.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bb7da9f3---dipimotigonupadet.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb48a217ce1---totilusevi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734eed5613d---68725369670.pdf
    • http://aygroupmuh.com/image/files/92395260958.pdf
    • http://chapelguild.com/images/usr/48492441615.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca211e001---38935696877.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/39bb210ac76559b1d39d5c69a8f11e89/36430904673.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bb4191fd9---popagijoleluleneperije.pdf
    • http://jullien38.com/ressource/site-image/files/62329127573.pdf
    • http://ddaengshop.com/ckupload/files/wedinamulosetaxumepatu.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1nkdo369nlp6lbol291pmtgs7g/pazamimu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfddefeb432---172739067.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bank+account+closing+application+format+in+english
    • 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_off0000df9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 16792 bytes
font_01_sfnt_off0000f7ad.bin
95be0dcbb5a1077e839a4a02aba4d70349a3d417ec52208bfcae91ebc85fda90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 16516 bytes
font_02_sfnt_off000122b5.bin
6db6e457883c621680bdcfc72e45cede4783a46976cb563f1bfb64b6a7bd364f
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 11172 bytes