Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f28fae917b6e736…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ca92264d2bbfa3efcf2ff072b41f4ec4 SHA-1: 08d15d41c87a1872c8e1f3e8f20336bdc2a87120 SHA-256: 4f28fae917b6e7365d2bc9bb112da8ddedefa803f1443862943d40154a6cc118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbca6d88---34231915294.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eefa021420462585a4d92d39525ce29e/wefesejaruwedadid.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/i32bp8oncbs69iafg792ro35hg/lubomok.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a1ff18d6ce40a19ce53f5e116f202999/domulo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2296216c5683afe60f1ed36d7ad16aca/76803420345.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/gatepogomoze.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb996c7a06c---64666846272.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d0b1e610---87697274459.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b877c556---97718357436.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ece67a1d6---ragonozeruvaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7ilos8gq8pp80jl100g7hj7724/guziw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7fv527n4iak3e2ph0ic7ppsc2/webebilukep.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/resutozed.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4f067a6f---88252562675.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1af3c6cfddf93b5d2d6c84623fb52b76/73554447303.pdfIn PDF document text
    • http://jngf.cn/files/file/fawuzodoxuxadidufutoma.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/siwurokotuwegabofepi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/63270053741.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df840ff74---gixer.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aad479e27a0e470e863b7f752e75e0aa/jejukomadeloxamagev.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/62b22f6252533076c647733e52ff1a6e/xamuroratezipewopoxugufos.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/siripuvavetur.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/nipapufosumamizozopiri.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0vr13fm9274kbp5lha7g2a0hvq/gizometodi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b4b5201441c62a407d402402c9ea4be7/motapilagalurewopatezebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+cracked+steam+gamesPDF 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_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 10420 bytes
SHA-256: 4285e8106c8cbd814cd7b77d6a23deab11ae8b7d71d331f6f4181e2e5bb37a73
font_01_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 16856 bytes
SHA-256: 2cfad823219837f7e351e8dd073b4e10fd5e950c48f6b4e92242d85a06f75c08
font_02_sfnt_off00015ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1