Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8f0ca8173291d6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 20:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97f2296a1ff89081d79a2c5b7289ee0a SHA-1: f9b50fe2ff781fa0af61fda7de3ea28c64ef8185 SHA-256: 8b8f0ca8173291d68f677f5e61f4e761222e3c7b866c8dc38ef190a90dc729ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=theological+wordbook+of+the+new+testament+pdf PDF link annotation
    • http://automyjka.pl/automyjka.pl/userfiles/file/fosewaj.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d642201---93780804349.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/21154625006.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/4106609945.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kogovatituzobotuwew.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4757c1ea---33081315541.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nizinavesofimotep.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a487d1c29af---vegebok.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/10034865490.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6njfn60on29d15ae5edjdqjap5/baxore.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/javovisoxuwibumilopi.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/0e0b395080168f0a442d49307b1b796d/38159069466.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/84594273474.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/81a09612d44a47b1bca32e81f52aaf76/83766191718.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/fetugifupabawuga.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/99536324515.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/iqeaqh06cim35j107k47g13hdl/mikidiwaxoratasawegapaz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ffd0dce8---banela.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/natufenakuwegem.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4aeb1f996---pesizizipitejotamijidun.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb20e5b01---zepajamojaruvifol.pdfIn PDF document text
    • http://sam-global.ch/files/file/sugasurew.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/54084894081.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/wubawubovemijanibebiwele.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/95713168127.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 16896 bytes
SHA-256: 75684bcb8456da5b7de0e5f552debdf3bcfb6c5f7c52b9e0347a6f00ac2f570b
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 11348 bytes
SHA-256: 5d156a2aee4bcb4b054c82a418cd66a034afaa8f998b223734d1ee07e8a5db94
font_02_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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