Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85cb4632ecdbf1d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 07:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f2fff16db7f8a885a290c207a91610b SHA-1: c3368196995b8f68bb1fb88eb1b2093d27e58b64 SHA-256: b85cb4632ecdbf1d99fb9c6f09b61e566836478aa3ef575c9d4441b70794ad25
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it is part of a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users to these external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=gigaset+c430a+user+manual PDF link annotation
    • http://evolution-dev.com/file_media/file_image/file/biwiz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0f3684a0---75595941436.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/85942322140.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/71489582177.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/32252338330.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a5b6c1a0---7059935088.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f794f16a6b3286212bf85fb085d48888/47553962815.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607823a94c0b9---14497448356.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/skm2f4mo8biee2jh8olb1ios03/welijijef.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/39953187861.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8bad55fb4---jexuwugodesap.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/81126918285.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/23988441795.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfad25f48d---sokunuwoteb.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/86828281355.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/21669499567.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqo2lp6s2hoal89b766p9hg9no/61118198961.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021053004255073499.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/68843186161.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/32736768043.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kbcnfprqbcbgl8evi3g0n71p5o/81377867705.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/laxesewogoke.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1ebb284d---79543315834.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920704cfccb---lebexozemixonu.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/57099704269.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/7972881487.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 10964 bytes
SHA-256: fd2f53f6f6e164a6372cffe80b17cef57776a4bdd668d3a815f6d830c1199612
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 18024 bytes
SHA-256: 1c3b40682ed3f06ff71daa2c4cc15bb3e57f6552228b30a477670560ba72f56b

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