Malicious PDF — malware analysis report

Static analysis result for SHA-256 824520393080f6c3…

MALICIOUS

PDF

92.1 KB Created: 2021-07-25 18:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cef5af231f6afd3d48364e543d6cac4c SHA-1: c49542feeff6617471862bd9e339da6d341be451 SHA-256: 824520393080f6c31d49c12e89e8d3defe1f62cd5e8786502370bb9c082e3cd2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f1437ca2---polujigifanenuxav.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f1377e97---nudijofepotinividavetar.pdf
    • http://sibservis.com/ckfinder/userfiles/files/90289544498.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/gavininive.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2e6ee12d50082cfed0b25908822fd4a/59452248589.pdf
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a748de9f938---48045752072.pdf
    • http://digivideos.net/ckfinder/userfiles/files/62038809370.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8a91f8aa249f32d674e84eda23404fb0/xejunigozovidodowafutinup.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4e2e389a7f9022b4c7c2a91c718a52d1/jadulupofi.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3963f2d54b6de497f997d583bba8fcb2/36052903088.pdf
    • http://flygarfield.net/userfiles/file/13696054704.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/fusipiredodikul.pdf
    • http://silesiacapital.eu/data/file/98784608912.pdf
    • http://lagostena.it/userfiles/files/96971027790.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2j7nlkl287orccc8t7iqr9039q/jiginunexejo.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705498f28c3---956044138.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737905b7e8c---bepowepare.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062ac8d692---wewufikamelu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4dqi67m1l7btr2l0tvh68e0p16/goxategiwuwawid.pdf
    • http://apluskleaning.com/admin/images/file/3860347095.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/valutov.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ee11da10369a0507d6a3d4c0697da968/99017071399.pdf
    • http://palyavalaszto.hu/teszt/upload/file/99623970538.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=carta+a+mi+esposo+en+su+cumplea%C3%B1os
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
font_01_sfnt_off00011bb6.bin
aa73d71df14ef60d32fb2a3a4ad1cb5a20a898f475e8acc085ffcb6b0aedc476
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 17308 bytes
font_02_sfnt_off000146e7.bin
5991f535a0368b726ed7f001b319284dfaa01d2d5fc859600f0b2bf31917e992
pdf-font-stream PDF embedded font (sfnt) at offset 0x146E7 10872 bytes