Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3de7cfb524423f…

MALICIOUS

PDF

94.5 KB Created: 2021-08-17 08:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 504bcf9e226aa654bca66f763d9d50d0 SHA-1: aee627d7fd84810d84947f316549d12f096a3966 SHA-256: 6a3de7cfb524423f15859f493b60ea52ed46880bc716ad24da15924f155d452d
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 identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://come2menorca.com/images/file/36361706767.pdf In PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/6pn6uvojg7oqj1loe30fu7ptlj/nubibagiriwina.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f4107ae820dde6a25a9d1e640076ef4c/6313324465.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108020635383976.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34284157473.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/fixubajuwulafop.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/golumis.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/35303779766.pdfIn PDF document text
    • https://birotex.rs/images/files/benifek.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/fibobegodirovuzamut.pdfIn PDF document text
    • http://zuche0551.com/upload/file/47367441964.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/9pr4n222bq7qr2g8mbrrf94i60/16534489712.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8041c67276849c9c6985d4dee9701934/xogekopolepurulogeruduv.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/javazawevowadenala.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb05b2b83---87470444595.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1483773a3---lofinabewejezepapubemido.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080948eb4c58---senosem.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f18e8caf13abf521550262b1caf2c2f2/patis.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae155b28ea---12613664637.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f04b0b4d---mezanaga.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/55614333145.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c799f5fb8a---23760270461.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/dbef73b41590cd535dd3509ad5b35fde/boteweb.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/23407124920.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba781819040---69390392608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=conduction+aphasia+medical+definitionPDF link annotation
    • 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_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10916 bytes
SHA-256: 05262c27216851b5c4ba4feee4a118688e53236f7fad7b6dc0716f851a49926d
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 16788 bytes
SHA-256: 0b0f31ed5034277abf2f40e28a7a7e0e9fb17de36c5ed479e806c8dfdeeaa124