Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c798d203eb97d9…

MALICIOUS

PDF

86.0 KB Created: 2021-08-22 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 12abc4e33e817fa3eb295e4dc887185e SHA-1: cf6bd62904eff4322046890888bbad954a201a89 SHA-256: b2c798d203eb97d981fcb4010312a41e764c3c5d8fb4ed50ebab8c997f9f0b07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its content, but the presence of multiple compromised CMS upload links reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=bc+ground+search+and+rescue+manual+pdf PDF link annotation
    • http://legalinet.eu/userfiles/files/21400348387.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ef84dfba---sibilobaxutiga.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gomusar.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/tufetuwewijotapo.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff74854034---1632049116.pdfIn PDF document text
    • http://pvvc.cz/files/85223419701.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf97913a2---53145446396.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/19848007342.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7a863076---58586999407.pdfIn PDF document text
    • https://t2sc.me/userfiles/31846749648.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/97727885378.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9721c7ea3565ea1718216d9a78150bcf/1277538569.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/20829916845.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4c2dc721a4438248e620800a5bc9b87e/ferilodixokeva.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/74779032776.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/13087480171.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1f509aa6---kewefew.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/xizovezaxidoradosibuf.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/5067559189.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4ea6defbb6a590616e83abd73acd91cd/pumekumawugifezid.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b23fb3156a0---nomufutugezedefogupibas.pdfIn PDF document text
    • https://tavio.ru/files/file/35913158779.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fdb0671a---tutinig.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/36578894858.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210512065951.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210725163717.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/gojuwogakulunalabig.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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 11032 bytes
SHA-256: 033f7f09689476cb1062f74143b28c90802d2b89c6a6f62fa830e682925ce008
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17212 bytes
SHA-256: 467b75090aaace7c22e08b6d6080d38356aaa9ff78b7e0edd311c8238880ade4
font_02_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1