Malicious PDF — malware analysis report

Static analysis result for SHA-256 9088428b14b45755…

MALICIOUS

PDF

77.4 KB Created: 2021-04-30 16:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91fea2c17abe7c65bb5b9f3aadaf22c6 SHA-1: 4cf73469e05ca5cff57f7726ad30458e8c9b3a83 SHA-256: 9088428b14b45755d0004b7fa052bdb18059e0d02976393c830bde812ff7d485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links are likely used to host phishing content or distribute further malware. The presence of multiple distinct hosts and a link farm pattern suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bbb154af---subedakezanasi.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e73cc55---46864932608.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb667abdb8---lifekovuririfamo.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61d2ca59d---fawutikidug.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ed12eb49---9720959291.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160778469066ed---12164933257.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0d634a06772385b2c72a8865198b0b60/sigukubidiso.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/10de7o8at81p5a1cda3qbel77i/mesepedativogemamoriw.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ed8qk8tgek7mb1b7na320p06e7/74154169690.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bku17k2i663igq9ddj9jeu7rr5/laxemobujiweromipif.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6502ebb6b---kokubolekotavabawozeg.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/daa8ebb147423a82e812e006067ca3de/76874173530.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bb7eb2e---xixavosutarolin.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/12b0eebeab67890b2a3fcef94ce27e79/dogufofeboxoxudul.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086125483e12---36712851831.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5957fca780e2cfde917438d80b77f833/47819558947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=answers+in+genesis+science+confirms+the+bible
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e510.bin
186094e72745ef20b737c2ae6ee5dbaf065bddc504ab6f9151fd05013bc845ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5096 bytes
font_01_sfnt_off0000f642.bin
ab368314009f71258e454ee5b8a7e3570fe9b89c0713f07dc8a0b91361c9083c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10680 bytes
font_02_sfnt_off00011a88.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 4324 bytes