Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfb01ad3297c37a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 23:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 219739d17b2546f7d7cfa972ec3dbefa SHA-1: 08c43574c93cfd21d74ceed98791bd3c881357cc SHA-256: 8cfb01ad3297c37ac789620ab5b3dabe5f80baa03bf37b6d1e005be740cfb229
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=materi+jaringan+tumbuhan+pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf143a1cbf8---24810428961.pdf
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/45617565127.pdf
    • https://censcakmu.org/board/file/files/visanivex.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/18648374670.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e71e83ff7---tokalumekapow.pdf
    • http://qigong.ru/userfiles/file/7740278483.pdf
    • http://greenhere.cn/upload/ckimg/files/202108291602369806.pdf
    • https://vinacomvietnam.vn/uploads/news_file/94902221005.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31ae9f646---zaretamimizifakulo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b540962fe5b---90862663088.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23287099450.pdf
    • http://ychnjl.net/userfiles/files/32400064634.pdf
    • http://nadiadsa.org/userfiles/file/datekufukafupesenurix.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7eda595662a78f73695915b3893afc39/lagidozex.pdf
    • http://asirakademi.com/resimler/files/14094342200.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9d526624---77595177415.pdf
    • http://anipetkingdom.com/webroot/img/files/26186057996.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611f49a546237---51416276904.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e581f64fcf---37224919768.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/46260512823.pdf
    • http://candientu24h.vn/webroot/img/files/61848922537.pdf
    • https://aiaciran.org/cache/fck_files/file/jibarabo.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b9f6c93c---63939648734.pdf
    • http://centronegozi.com/public/dopito.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48e.bin
2fa6e439af5d0c46d6cb4f28f0b29432a7ac6ffb5f64a32a04f7b2d448a4e20b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 16612 bytes
font_01_sfnt_off0000efa4.bin
d3240a34b664e5d685382432f32ada25e0ac02c0fec96b8691789b0a35cc7226
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10976 bytes
font_02_sfnt_off0001086c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 16792 bytes