Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac3e37ca0617d98…

MALICIOUS

PDF

88.3 KB Created: 2021-06-29 21:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f57c66eda6f9a48248e9aef14e65bdff SHA-1: cb316cbfc88c5b20932e2ab34b788a5d40a45fee SHA-256: 9ac3e37ca0617d988e2ed529552f16d670b8baff7f873979bd2d9b42cc6bbea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malicious redirection intent. The presence of multiple links suggests an attempt to distribute traffic or host content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://x04ydivan.ru/userfiles/file/89429721291.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785fd8244f8---1096705475.pdf
    • https://dm288.rs/slicice/file/87480290133.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u5eq32bfh8ovtbe745hio6vh42/gikevuz.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160879e004d6d3---xujatofawekofek.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/21c45fc8bc162c264e0ddc58d60ae479/pilunepapalotodipufika.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/10345770054.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/dovanivizogikikafavi.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ad35ff34d602aef7ace4281f24d9fb08/jexigenivek.pdf
    • http://lookkorea.net/userfiles/file/fojepanezoru.pdf
    • http://naviway.su/upload/files/majewudolozikiferegipibos.pdf
    • http://misosmile.com/upload/editor/files/togubawaxo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd93033861---14824883485.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db710df8b---5579626321.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a04d4beb26---49715429493.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af7923a74cb---gepobuj.pdf
    • http://www.aadhar-interior.com/userfiles/file/jofimipa.pdf
    • http://imcborivali.org/userfiles/file/bikejebud.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8e58efad---41834618314.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31550ebc29---23955649705.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/506d51601696661c256f390c6b7318e5/timinenafesenuretigewojo.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449a2bef22---wimojuwuwetepedizamupes.pdf
    • http://www.hydro-tg.pro/upload/file/logoxakukupedoluwizogex.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/kerikigemo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wake+up+in+the+morning+rise+and+shine+song
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/18f03f455878856d2985416d05e938ef/sezorebaser.pdf
    • 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_off0000f352.bin
f80e79bea9644bddcea387570b8eada15195198a4b54c769ddf0f88de119010d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 17792 bytes
font_01_sfnt_off00012251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16792 bytes
font_02_sfnt_off00013a68.bin
5a95c9f298b1cd1d6982c846906b2a8f85fd9b7bd0db30fe92a0af2cd9e6f086
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 10980 bytes