Malicious PDF — malware analysis report

Static analysis result for SHA-256 6039aaa7d0900800…

MALICIOUS

PDF

72.2 KB Created: 2021-06-21 13:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a0b8986cf4a36e2272b6edd3b115194a SHA-1: 480f6467c16d85a1b64275cc316536d076a426eb SHA-256: 6039aaa7d0900800a1e9982901111987c52b85bf7782bd4f5c53b2abe787277f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ebabcd6256a461195c9d058b5536124a/wugitirisogimibiz.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3i17af5l2k5gpsmv8frhi7ecaa/fadoka.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f9621tc588932aht31v9ki9fqm/56494851757.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59187673728.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kdaa18qis2co8t3vijec4542e6/9753448024.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fd2aedf3---merepakarugodowarul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099a688334f2---kimuzolofosuge.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/431mpnoi0oa0eopuf4e7e9tr33/19345546524.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/67309710573.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/g8l88ei83pj4ofo1k50v3cptl3/69566486956.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/n85o4q6npeb0ds74vj68o7rib1/79997183274.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/banabokobonemufozinogiwuw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe99cdaa6d---zopizinozutavuduxaguziw.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/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+transition+presetsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 4736 bytes
SHA-256: 4032529aa5029103f79f0d99dda30a018191b5f58538a218bfb85403d1c069f6
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10456 bytes
SHA-256: 371cb6a12d2ee7deef32aadb0f2a4b79ae318e9aa4f4707fa726c93f0fe2f2a5

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