Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac656e08a07a71be…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 13:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53c2f92da546a09cf8d826890dafb856 SHA-1: 371cbd34f7f00f22bdb569c6946f03848415bee9 SHA-256: ac656e08a07a71be4ec2f0f919d83fdcc7915ec88216a6fd57d18f1b27d7a421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=coc+best+attack+strategy+th11 PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6bda6f669535dfa244d6820872621218/vitulatufop.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/1094109968.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sezezimepomalusavub.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/27128699461.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/imsf0dh1e69fhu6u8l8o364ajs/99384198714.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/2560104612.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4a5080e4a9bd98e4b31e1220b0f902ac/jotumoxozigufatevejubaj.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210707_964737C774127412.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/18030166776.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/lekapejuzevovalur.pdfIn PDF document text
    • http://tavio.su/files/file/sexedawawikibatu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/13633214385.pdfIn PDF document text
    • http://kco.su/userfiles/file/21530111831.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210620/172744425.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bakukogemajamuguzudola.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/66499802853.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/logevevado.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9c8b6daf---zilatimanutuvowugagaxude.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/560560786.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/99301839219.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89791c535d---bofilofegagafoxudagepulo.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/monoxisosodofexofemepegeb.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/11223686172.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kebirujiwiso.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/95029412469.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/59703407097.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/21c2bf40b283c1288d27694f3b3cc99f/gimebivupivaredofo.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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10696 bytes
SHA-256: dc99514c8aedf12a3747ae7fff32ad968dd1df8f2bf4c9dd9741070ef007765a
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 18268 bytes
SHA-256: 4438ddbf70b87dcb0c902c8502e9a591241936f045aa51d1a49204ddf7ab14d9
font_02_sfnt_off000138b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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