Malicious PDF — malware analysis report

Static analysis result for SHA-256 13112e66bb07bcef…

MALICIOUS

PDF

66.4 KB Created: 2021-09-03 11:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 696b35de1074b7b0e45c2881c2c61870 SHA-1: 445d4acdd01c76181d2982b48c0fefce38ca5c1c SHA-256: 13112e66bb07bcefa4649574137bba8e882a96d94116f2bdb4bb51979e6bd8a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=hipaa+policy+pdf PDF link annotation
    • http://studio-orlandini.com/userfiles/files/xiweza.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/gudixu.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/9701221083.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/rivoset.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb73736994---60985055473.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/rowegevilet.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb626664b87---12346754167.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b1ec60071---96702624760.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mmnc7rad5hbb6ruttbci6sg26d/91060019517.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/baxotefujimalex.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/79776360791.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2dd046f1---vobanezepakofejix.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/21370919642.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bc5fb21b97c384611e4d5dd1b9c1e907/tefokonijetofoloxubebe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5d08qdcsfl890p6aa6fujd6oeu/xatujafepetuzafu.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d355e788b7---timakege.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/tefezufe.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217316336493.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5in9qgs9012bulhmf3vlveenn0/bazoguwuviv.pdfIn PDF document text
    • 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_off0000abf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 10116 bytes
SHA-256: 0a1d1c139e346e54ea3444e51a3218f4325eedaa586706297115b7cfa9b87040
font_02_sfnt_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 13896 bytes
SHA-256: 2e2c85f2251d62c8287d942606e7225a6446e9736762a8d1fb10ea5bdb93cbce

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