Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb658cdd33a2b420…

MALICIOUS

PDF

118.1 KB Created: 2021-06-09 12:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d7edbc3f9789d116dd55d003132a42f SHA-1: ff5941f7f320e3947fd1af69a6ddfbe4819cd217 SHA-256: cb658cdd33a2b42081be5252e604e3c882b214510d9c659303f32ae325f8eebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or phishing lure. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=episode+2+season+3+yellowstone', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=episode+2+season+3+yellowstone PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad69a71f83084afb5225c01e5d10c3e7/nujatipofiveludabomer.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2125fefc7a4b6e67baa469f311a11a1d/danisedefumiwusedituboje.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/99866946837.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f282727d51---9278376169.pdfIn PDF document text
    • https://melz-feu.ru/upload/46789233647.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/39655218959.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4mmtf5qask50fb5ksla72r953v/ludemu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/xivifotasokabevakebij.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c96591cec0c435f7784fd35f00312a6f/tupexupesazijo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c0f9fc10a469ce1401a2105f683e3bad/sezejopojinajifep.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9e95598ab41b720fb7363de7bbce9509/63875024112.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edb497de8---wiruxotaminagatusajuwavo.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/11648691155.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/59cc7de66619320629bcff8df5a8707c/livujuramitugesitawalekem.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985d7d7bf14---9161477911.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e203708dcc---27676050138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DB 5304 bytes
SHA-256: 093c5cdb6a56fe59268a618f19ce40b76063f0ed6d237975c588b9e3f03f835f
font_01_sfnt_off0001a412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A412 11088 bytes
SHA-256: e88d1cda1ad5d11bfd141b0f7393948157cd111e8bd96062c1b5259f3493dafe