Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ad7ec2c63ce888…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 06:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ddcfe24692a125c92ceb49f8b93556dd SHA-1: 2e1e04f429336c8e3fa9330b189e4ef677561876 SHA-256: d7ad7ec2c63ce88870e16c10bc628ed16042a276efaa643950f92e869d321e36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://abbaorphancare.org/survey/userfiles/files/80288975567.pdf In PDF document text
    • http://zezoalza.com/ckupload/files/18838722756.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c87827c9---2344445891.pdfIn PDF document text
    • http://nenorm.com/files/files/xowisewisuru.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/41128854840.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/91957214946.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jutadejisened.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/27139890210.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/71414741569.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210902_033193F32C35B053.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/72274629778.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/12482500154.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/gajimebodowu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547ef6eabf---podomupoto.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jelesepilorenuriwi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/sapudutajoluzawafugok.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9f3d535eddec40cc0b249358fa858f0d/danujuwoberif.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e15dd10c---3345270789.pdfIn PDF document text
    • http://ccadl.com/files/20210912214937.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/58355598986.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/xedizovaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+sdk+tools+for+pcPDF 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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 18324 bytes
SHA-256: 094d28167329a0d64066cb04ffd0b5f43d15c7ef367c87279d4dc228f1db4c75
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10392 bytes
SHA-256: 4b5564ccfc332091d23be111dc04ce297acdfecfdbc1a577044a7158da6293dc
font_02_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1