Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b6c336e943b352…

MALICIOUS

PDF

79.7 KB Created: 2021-06-19 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d188f37f93b5bd2c9ee2270550f0424f SHA-1: 4e526ab6e8fc5cddfc05498d351cf484827988d1 SHA-256: 64b6c336e943b352892090db36f00a90289ca443618000d41e0eda268aa0681e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to compromised CMS upload storage suggests an attempt to distribute further malicious content or redirect users to phishing sites.

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 https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d444d55a39---39168947425.pdf In PDF document text
    • http://asiancfea.org/userfiles/file/rufipiritirusaxulukesuj.pdfIn PDF document text
    • http://holzbau-napetschnig.at/22333576694.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/72ef7d0e3ec23905c5321f814fddf5b4/90727608079.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qls375hj6obbi8b4api43ujpob/14427962608.pdfIn PDF document text
    • http://sciattella.net/images/file/pinobawujepadimizozuraj.pdfIn PDF document text
    • http://hasyo.net/files/file/sebobo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836d5d675---patulegu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/67574979309.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/81805334124.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/49fbbcb60900e0ebb4b13f3f9a9a2a06/67210239525.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a968ed38ce2---68416200940.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nevikalinumitojag.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9f47kg1hd1ghdohf7cq3rql38h/38834288971.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/jblpkjlsj0u287tcc2kua1p802/mubofagitezesaninu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b469b4380---66178908497.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/15822264561.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc117b2a37---34217506007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yellowstone+season+3+list+of+episodesPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 5156 bytes
SHA-256: 1612f3c2cfc594babad4e14795aa20fa3af63b76a508123680f7b08278f00d64
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 11436 bytes
SHA-256: 71fc8316ab307652e6c80f399a01e588dddc569a4eff33a797d6dd20a9ee71db