Malicious PDF — malware analysis report

Static analysis result for SHA-256 0101bec3b1cd7e83…

MALICIOUS

PDF

89.2 KB Created: 2021-07-23 01:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 236fcb0e4b438b910f3a01969fba3969 SHA-1: 930a3716b05d270dee65dd74dd7b780bdf60bdea SHA-256: 0101bec3b1cd7e835641105f81c743720ec96c751ad7371ff4aaed877876f018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to entice clicks. While no scripts were explicitly extracted, the presence of multiple external URIs and the ML classifier's high confidence score suggest malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drsaman.com/files/62267813391.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094557960547---laxadofidipuxabe.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/zedajuxodejaga.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/96523050062.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ce04b55aa36e888402894ea698ceee5a/nelakej.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/pifupivupu.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f0ae8ee8---58616977124.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972030a35c0---37498416823.pdf
    • http://benhvientantao.com/img_duhoc/files/18395904950.pdf
    • https://dichocungtoi.com/userfiles/file/19957006862.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tcbn83ac29a32a9b53l077nogt/6384997283.pdf
    • http://kryotherapie.net/neu/userfiles/file/67765949068.pdf
    • https://dentalrud.com/userfiles/file/mefufuxarotutuw.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b984678c45775c80901c770d5ee02c37/wulaj.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b176cf3f255---94097766199.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ng1dio4fv3ns3o2gchisg6jufd/makarawexevuvanagemajalit.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1e71e8f0---tozovapiwizux.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/t3o8k1bd59oadvm26jqmk86o0t/verafowe.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e74832486---levajojidokibiz.pdf
    • http://arabstina.com/ckfinder/userfiles/files/fatijowinijukowodobok.pdf
    • http://ufnk.fr/app/webroot/files/file/simoxeleposazaxa.pdf
    • http://salkim.com/userfiles/file/32822123186.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=national+lampoon%27s+christmas+vacation+drinking+game
    • 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_off0000f79f.bin
0ec036a08d15f389fd82b04e4125f9abaa48397dba79bae6b9e7e64b57dbb9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 17140 bytes
font_01_sfnt_off00012454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16792 bytes
font_02_sfnt_off00013c6b.bin
4691837f3334c6a62928f10256131dfda0a314c40c002caeebb4a14bb8d6f450
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 11128 bytes