Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41e4d41ab2a4a67…

MALICIOUS

PDF

100.2 KB Created: 2021-07-31 11:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a171d5f12715ca721fdb352168566a03 SHA-1: 91ae22babd36365d21107ae0803439d1126c945a SHA-256: b41e4d41ab2a4a6776f4fcec94017dafb34308dfd16a16175e1f45a865e3c9f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=vegetarian+keto+recipes+pdf PDF link annotation
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081395198d1c---witeli.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607413448389c---75353619846.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ff4b4bf2---81331146361.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/86177404254.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/nuxejimivob.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zodumeka.pdfIn PDF document text
    • https://vestol.bg/files/file/xoruledat.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/915869699.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/gitujoselezug.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224ff1137b---kidokorov.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/18390084892.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/wekizukimegipiwobul.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c10a8db11---winido.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75702228d---31359431594.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/12552790700.pdfIn PDF document text
    • http://premium-h.info/files/files/bakuzakaxogudavevuraf.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/4999808100.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32a51c335c---44005071695.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/woxelanufusufax.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f18d5e7f9772d02267e03d46e1539750/13353586615.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/navipered.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/ditera.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_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 17692 bytes
SHA-256: 90bbc89ab39dd0f6a2d4e3beaf877e34b781b33152eaa29b7a317a51c787144f
font_02_sfnt_off00016931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16931 10808 bytes
SHA-256: 88295775f493719cd28c94879ef125e4c20979e97582ad5f74dfe93c83de4c25

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