Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ff6d5534a32c1a…

MALICIOUS

PDF

77.0 KB Created: 2021-08-21 19:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7f5894c66097a62ef5342e760c0c72a SHA-1: f1e4658b999f7c593a84fec0032051cfc9e2f66b SHA-256: 26ff6d5534a32c1a0443b25498ceb59c678b3380efe2417c6aaba6373d4bc605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to identify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mlmrockstars.com/ckfinder/userfiles/files/29171945686.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/93d876297fff2a08e7930f816116aa51/zutawelizojam.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a2e77b8d---kasamitogogitefope.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fiwexal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612116b8f1105---tirokinodabezolefexajujop.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b5032055---felagabu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1c717c1b1661c79c4b1da18339b8d6c5/49049774907.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kibad.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gibomelakelimebo.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/80170387449.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gilasigarajumakitet.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/75021665242.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nawowidano.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/sekakufididujoke.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/fuwekevanovanilo.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/fogedekukilukudetivo.pdfIn PDF document text
    • http://zeci.nl/im/image/51803892096.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cd35ed73---35145368669.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/gumuditepujibibumiv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba3f2b952---momez.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/394559458.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/tonixuvoxobibize.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dcdb4c13b---86012330953.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610684f233fbc---fapekodojenezekuzakepen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=youtube+ferdi+tayfur+filmleri+full+izlePDF 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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 17540 bytes
SHA-256: 404fc568457f27c91e643ce3a4e794ee87dd6a0ee57d3f0bdf07d2d66c490ae0
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10640 bytes
SHA-256: ce7e458dbfa68ee2cfe15e55db5e6cd501fa994e5852a19f08d34064032ed548
font_02_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1