Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65a256809b80bba…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 05:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 757619b401fd7086d8cfb05828184585 SHA-1: 4acae139db0302db7601717661b7b7858ffc066a SHA-256: b65a256809b80bba79e7d17c1a51f23158f9ca9a93b84ab9e8f9f66d45e90b69
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on WordPress upload storage. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=diversity+training+manual+pdf PDF link annotation
    • https://heart-calligraphy.com/uploads//files/202108070612208212.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d30ac288a2b6e8cb28383fe3198fc700/34041839407.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/fazupukerativekoxo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa26724341---ripuxumelokobigasa.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/71248256150.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708d5cd085---jasedinizevugova.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/31671340192.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c29a01c6---xoxusoxefuxatevamazefes.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/11852005729.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119a73b7b55b---86336318716.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3146fedb6880556db94212517676d093/46346529292.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2b3a84ecd434d69238b425ad411b19d/20859007046.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/14f8df2848a9d23efdfc64ab44c4479e/texamiputokodu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8013ea9535---54875407194.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe65c15b9c---sokilijomagabi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610557c8d8c4e---83502091295.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/7445052004.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sadofojizijob.pdfIn PDF document text
    • https://seikai.jp/free_images/files/mewis.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/35202715607.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95b668595---fezadis.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/nilubedonepol.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836df141b0---zosabinew.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac207443b48---81941351854.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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 17120 bytes
SHA-256: e6a018156e30aa0a6a551731459b8ac6aad717e3a080ee57b7d69bd68c2274de
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 11000 bytes
SHA-256: 6c874a05f898e60449e9476c2814b627db7e8564d812eb5554e874516508e95a
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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