Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3fbb4f077d2e6d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 13:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 084f57d7460ea9f5ec6ea807c195b52a SHA-1: 1af56dea0f1c6fe367a75d03b58b568470eb2d57 SHA-256: 0a3fbb4f077d2e6d13e4854e4dddc9eb81921967642046f3d0acd8337f9caeeb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=football+plus+new+apk
    • http://goopenapp.com/uploads/files/fezulipimarapoxid.pdf
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/22848840731.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5397a667a6a5eafdfaca45c05ad16df4/72442475594.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/62828480875.pdf
    • http://fishingas.com/userfiles/file/80463770744.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/zajepenavuleremavozazeg.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/6230419635.pdf
    • http://sissonne.hu/editor_up/95455111034.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b030537fe87966c27efb3e40e4a289d1/batokepalurazale.pdf
    • http://oembag.com/uploads/files/202109071918566083.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/ripowufil.pdf
    • http://zanethompson.com/userfiles/file/10997920420.pdf
    • https://adikkeempat.com/contents/files/vemopakifoviva.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c02d54c64d8a89dd961d9705754c26bf/59353705563.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff8de515b---25981878392.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/mudilikujifomiruwanovular.pdf
    • https://a2designbg.com/userfiles/file/7863922623.pdf
    • http://recuva.kr/upload/fck_img/1630612497/file/30097020119.pdf
    • https://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9ae7077106b10c3f066b42c4e0b86daa/8195029581.pdf
    • http://righetti-ticozzi.it/userfiles/files/97620738281.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202196858388865.pdf
    • http://goodfortune.hk/UpLoadFile/file///77726842352.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_off0000ba02.bin
284e74bef42513733fd0f39763f93920920a97e654b40c7dcad0a3ca05b002ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 10448 bytes
font_01_sfnt_off0000d1c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 16792 bytes
font_02_sfnt_off0000e9d6.bin
5e9a337e77a7a7366db63da11bcb518ba11d5d2f3c24cd293d6300cc1ea629ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 21064 bytes