Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ac90bf238c121c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-08 09:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1136250252e0c6348befc88a47a0a699 SHA-1: 715d4e510423ac6f6aed709266502f22a6821ef3 SHA-256: 62ac90bf238c121c24b3ef8d662f9fd150d0ece11567f87a65b28f6b04bb563e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mpti.ru/userfiles/file/73730379842.pdf In PDF document text
    • https://mokhalasati.com/userfiles/files/26271724161.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607189e8c1460---75613267548.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/efp9vknsm8617qc5d01divol91/xadeluliwas.pdfIn PDF document text
    • http://sam-global.ch/files/file/dufes.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/57817286593.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/bemifexuguzurojaruj.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/38875671010.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/80112713696.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/ruwagadowizez.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/43909335523.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39dd33a28---seveguvewuvugivud.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7d84b7b92424a86ecd62887d64f9f3c7/62516614360.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/godumonumifozagi.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/62081960998.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zelezawelorajawosobideb.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/14339635768.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/valud.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/gazixuwanuke.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a3d816b1---77208699959.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8158cbb1---82079746142.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e202477d401---38868877542.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210819203630.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079426b7e2ea---guropibenu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/81013472340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bribery+act+2010+pdfPDF 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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 10776 bytes
SHA-256: 79780663853d66188d68728bbad5d720e03bce5eb23bbc512591adaed519fbf4
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 18388 bytes
SHA-256: 1306bc1a8dfdb05f829aa26c2e95f45d5bea202b4adcb77ebb85f8fd1bea3eeb