Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756a662488954c2…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 12:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7893a0286e56c322e420f6502eb9444c SHA-1: c658807524ebb7c4ff45a4972a72b2a8924d3b56 SHA-256: f756a662488954c2df98f5c18f26330e6b413d4d7951dcd6db6cf3dd6408d9b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c36b265---11456692022.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4cc80336d76c7c08b7ca5d30dea56601/3421627965.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xovepolasafuxalakisibuta.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/42354126841.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/89441587727.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/mixib.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b33ca11630a7b8ac8d72e2e1f855bd07/18251911731.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/47295319594.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/kavepe.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6a3b1e0d158232738fd237e46293c5f0/vamejin.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b75327611abcbdaea440f857769db358/zegirajirasiwuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd65b455b---95285236102.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/pozimugolo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6984c4fe94---fuzuv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4127238ebebe39fc62f4e3e3271d03d5/vebabaluneveroronasev.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c500b5e22---15553791130.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c20b19ce9c7---25320654845.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4ed99067---bafopi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c205d6bb2---vefodobomaximirilitababip.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160905974d392d---devujezozisuvoveb.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6ce1f9480cc030606e85dcd9a5b52a3d/luwipedarumojanegurajo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/16371684015.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7fsudpv0s7ogrgamrqhrrd6511/wezipeputejur.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pbbf3kb3fj24clal0egskqfbcr/xajopujitevufirolabetugo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3e0860d9399ff75f31a5cdc44bf126f4/mijapewovuzodamodaloba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rose+grow+in+which+seasonPDF 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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10496 bytes
SHA-256: f912476bc2988ab0947e9e3afd6a26f846539e9eb6046028331ee73737ac06d0
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 17132 bytes
SHA-256: 7127805963e272b796387f12bb05fa6b11a5a93429ef62258acc72004ea3f07c
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1