Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5e6740f6c8fe59…

MALICIOUS

PDF

87.8 KB Created: 2021-08-02 22:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e719661ebb13343509e1574357ad3d76 SHA-1: 48da88cbe78bb10da1b44bb843071a1a6497c2b7 SHA-256: df5e6740f6c8fe59c2b8e0a5056f5cfbf3ed1b7f187571dd0911d10aac2e390e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites, specifically utilizing the formcraft plugin for file uploads. These links are structured as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=what+penny+stock+should+i+buy+right+now PDF link annotation
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6dd726cdd---36366549891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842ea53de0---virofevexavoxawulufobom.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/51032107004.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/semigakeditolofok.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lajukesanexakasemuzus.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5830cec135---34605544325.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/8439456426.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ca95c687b---sikijomuragan.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d609f50f073---84408796881.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/57067492004.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/77303461255.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/vomoxujigadabif.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1974a448d3---dusisakababisope.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/58527426297.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/90665837557.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03c69d26b---70950346308.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beaa9dc03---56310346479.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/62801310019.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/muvopaxawolobometatubex.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41221135791.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf3cb6717---81628277137.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b97882c6e84a904b443a28ec4142cca0/78370533928.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277e2a7df---7226134522.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/40014220994.pdfIn PDF document text
    • https://wsbtitan.com/images/file/mufesigi.pdfIn 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://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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11320 bytes
SHA-256: 500c37da427f23e3a11a2de740a0273ebc0c700923773c66ed8b28fed1de5bc4
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 17604 bytes
SHA-256: ccf909eca8c9735ecd5cb237fd8223fc24ff1bb0c9c5bc6ef01a22005a0e00ec

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