Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c01317cc52d09c4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 00:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4bf7433e58676b246832ed0797e5035 SHA-1: 607bff0017dd5be081e686f52d92294917eb79f6 SHA-256: 4c01317cc52d09c449bb24cc044827a0d8f18c47863ca96177431d49b651c666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or malware. The PDF structure itself is complex, with duplicate object bodies, suggesting obfuscation techniques were employed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=anova+statistics+example+pdf PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/136127a3641ef522b6eb8b5a89a35f0d/varovupibalokawav.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/36231082688.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/36749722223.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/43424998429.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/36633384720.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/guxulenudariz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe82ab85f0c91fffb8ad16f3451a9f82/40556200531.pdfIn PDF document text
    • http://dc-28460bd9dc5f.liebes-map.ch/ckfinder/userfiles/files/9708111135.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c3cd63288a105bc36b7a9806e56a1e9b/6011035584.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/831388425.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vudufibo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff652b14b---jupegesimuziv.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rewesovukogezej.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b006aea30232567decebb92c10d0d8c7/13446396713.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jd51ia2cpkelubgv5kdf23b3o1/69115318479.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/20010813559.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xozijuwukaxigiseb.pdfIn PDF document text
    • https://highrise.pl/file/14166702144.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/49837557404.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f79564d6824ead5c88c4726349e37bd6/36476395483.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e321a824---nolotazabakonotifixume.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9cv744b6snocvv46n9nhhhc8q6/9504346653.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9ea01ac9f---towevegodusenod.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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 10832 bytes
SHA-256: 32bf55f11fd4b3dfdc297fb805ae2133e8fe70505cded55c54d74ca95a0c585d
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 16816 bytes
SHA-256: d4300a7443b62cb3ef65d1caac3698a8e60d3f0c44eb4d035593fe40ed08a343
font_02_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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