Malicious PDF — malware analysis report

Static analysis result for SHA-256 03264154dfb94f8a…

MALICIOUS

PDF

79.4 KB Created: 2021-06-21 10:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8102b834db9059ab9a4a4ad5bc686c08 SHA-1: 3a11a0a6196eb13979d96753d50241f9091b3a2c SHA-256: 03264154dfb94f8a32d1a8c43004cdb517a9dac2de4df42cc8939ecd32d75a2a
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to compromised WordPress upload directories hosting PDF files. The document's content is obfuscated, but the presence of numerous links to potentially malicious PDFs hosted on compromised sites indicates an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d8a861e6---82719075007.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d61ebe9c0208682e25ccd085d25a2df1/xurorotabelokaji.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u1jeccd2kvrqefh75r99peboq6/robaziroxoxexipepizubuj.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file/%5C/xigovuvoxarojo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8357d36fec7b34be5755f8d461e3b372/nilux.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/60126672143.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/zukiluja.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/90758432674.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/76203258163.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6420aad57df1acb88da652774b96afa2/fanadarewogugunalivumut.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73b21a79e---zobozefubijejupiv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8324a9d846434966a802c443d76b3c66/1265287684.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/u9cu3gqqb85f79o5am9bpipm12/wanazinubodebazonim.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/5606475866.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/91b83f119e5766bbae63e272e7ed7dcc/bugumogeruxavugibu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1db31324---guroposajugifuve.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/5215352803.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/25222293919.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0216534c68688f68a71409c0da4bc89d/16831487187.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/54498056334.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=mechanics+of+materials+gere+9th+edition+solution+manual+pdfPDF 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
    • 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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 5732 bytes
SHA-256: 175171b491242822cf3f218f4c71ca18296c4ecd9ef61e3a7c2c135a4743a4ed
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 10736 bytes
SHA-256: ac0793cd151bcaf7f33395ac1ae42d1d583a74a680266c7bc9529940911ac2cd
font_02_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2