Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fdd57a0ad1a975…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 18:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d10c3842850784c7e334be1ef9ca3508 SHA-1: 06edf6c8b5cb444fbbfe86d031fccb6c06bc5dd7 SHA-256: b3fdd57a0ad1a975039449934873874a816291c0ba962028a50b6c06bd3481e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a lure or redirect mechanism. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6eg2ave41gc6lfurf8dl130d4t/nodejosuvazi.pdf In PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vosowupik.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/76090208759.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c1647b360cc3a015553451ea7da937d6/442556387.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/rasapasadonosupizal.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fanunowikisixanikimil.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3dc9035---42320907713.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/munozunolajugiru.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8356c83f8---zamokirobiruv.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9abedd3337d0b747c2c32ad094f1a6c0/81569851182.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/33056563846.pdfIn PDF document text
    • http://sun-tes.ru/files/file/6373744120.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/69942475071.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/391d4646e91073db2050234bab3056f2/44068725647.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/734966fa4d4375e0b13e09f6d0ac638e/43597253544.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af3c9098f11---88970851758.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/28574c1b7d2c632d00caa6df3d8d28ea/97686848315.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160888e5d168bc---pefuzozalulemapola.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3617f5abd38643975299962eb2e90fb0/talisuxapenezofap.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofidijalixepew.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/kekubexuxugubeg.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a7380790e51985e82d43cf6b19943de8/lurebuvukudak.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/58412534989.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/20gv6uthg5nr61vabqq2kghv92/88217303072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fast+and+furious+the+rock+and+jason+stathamPDF 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://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_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 29404 bytes
SHA-256: 74b99124ce569fcf7d107236fef73c136bb0c6e726bacf830830eb4f1f177896
font_01_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 10992 bytes
SHA-256: aa05a2be8743ed6421f19650cffb73c999142ddacade77ef290fd6462744416c
font_02_sfnt_off00014c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1