Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fb6c4eb79aa432…

MALICIOUS

PDF

82.9 KB Created: 2021-08-26 03:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 56f9c31bf63ecc7789f39ef945858d47 SHA-1: cf08f9c06103e87d5e19786bff4ef50cc26d4c3e SHA-256: 07fb6c4eb79aa4325dd84a1e06f34770ef2b869bcd203f13c67fe5abf99411d1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://retta-bg.com/userfiles/84349524233.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae809a2ce74---93897980472.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f55aac8c777154b3f94d26e49a8df3e5/19426964759.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07d44bac1---nogewoxagijapineza.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/wagozepeduf.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/49765084236.pdfIn PDF document text
    • https://tonitomov.com/picture/file/tapititogozubit.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/potudesozizepizavuku.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/42770320263.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/h3bicvupcam0ao04ks9oe5kb76/diduronuwojaxavavori.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/54971662360.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061103480270554.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f061e185d77f4751e07b6a61346c6fd5/demap.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee28e9121d---tugesetugasijewuje.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dviuoiobsvq84okelrr7r360ch/zabebijewinadafekira.pdfIn PDF document text
    • http://kag.fr/userfiles/file/87207482888.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1c6f9e3e3a68dd28f3a88cbe85e6615c/21086698712.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043931968b---koluma.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qb6ivffd9tm6e3uj3415h3dge1/piberugemuzupo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6adbc8797e2e20df7f5b46a4cc5ab217/92268937251.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d421fad927167da31e96c8f3be211af7/16048981035.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/f57472b95803987c0f245879a54b7184/52224598349.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/nimazojepoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=buzzing+ears+meaningPDF link annotation
    • 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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 16420 bytes
SHA-256: 277f877de53632481e88401ab2110b24c38dc148b420d0ff122dd3bc86713040
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 10400 bytes
SHA-256: ce1808a178ad4680a203a018dab60217f27e170f208974394a361c99feb1e471

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