Malicious PDF — malware analysis report

Static analysis result for SHA-256 26beacc94c27cd4c…

MALICIOUS

PDF

80.1 KB Created: 2021-05-22 22:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63816962fa57285caea0f6a55d64791f SHA-1: 81b72c17d0359c5495796a4e6cd1e6c8ef4daf0e SHA-256: 26beacc94c27cd4c6c684314c4c761f2b3e3943ad428e225bc8e0dcc4b41def2
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage, suggesting it is part of a link farm used to distribute further malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd42e1888d8b69ad2ab95b6ba5d595ba/gezawaxitelafif.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078014f9d6ea---90969333485.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8efd4f71a---jepovovudafasi.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2d62175f3f2aac3e9f5e64c8fed54111/37704479787.pdf
    • http://akcjonariusz.com/UserFiles/file/14481129366.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609642e1990cc---figovelubowifopugoji.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/aj223llul2fim03n8gjdacoeck/10984199369.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/38557927130.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c878203e---64605690629.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/72d83d840c66298e80000894b8be5de3/92254565281.pdf
    • http://dmkaudit.sk/101/upload/file/23941656359.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b169eefaa8---ratidesezasaposew.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/461bd34ebf6125abf12924b83efe3091/kixoviwizurexomugisutovot.pdf
    • https://beautyyaurient.com/editor_upload/file/sanetupevolak.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6k645jfr1bc16it5kloumbqkj0/vumugefado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=past+tense+verbs+worksheets+for+3rd+grade
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cb.bin
94cc71f6fa7bf7748e58660e06866db2235b2d0972c079aef878819c2793b1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 5660 bytes
font_01_sfnt_off00010c27.bin
8e6eb7642cb3614725053534d4e847ad8dad08344ef0e464d42d373bd62fcec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 12436 bytes

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