Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e91e93118917fb4…

MALICIOUS

PDF

74.7 KB Created: 2021-05-02 02:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81299c876e8213014f94e781e6223bbd SHA-1: bb9fa0d22d51e0fa6c2347700dad679cdedd5de1 SHA-256: 8e91e93118917fb42927ddc3df61a42190bab239d7016324cdd40cc1569155ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/om12elk6t2h0la6u86p1nhrll3/pexuzamiwavilof.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ua8gmnja5j9koijrns07mr44vd/58644007642.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790ab04922---gefetag.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160777eb6487f8---95929635964.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607116d377eac---zoloxigoz.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/r2jm3f7sspb7v2svh1jt61c2g7/34995945145.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd5dec473d---55506405612.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b2deed6c0b8ee839870538924aa93442/jokorugexaxidufanur.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/caf282f44dea5bb6cf86a3a9622ecdbb/japuguzi.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936ced842---kopukoxivomazaxod.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be882519ee---podoreduwivilenazi.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b8bee6716d5ec60638187661fe45546/34883727503.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ec6d05fd---sisalawajetowizezezezube.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5e34cve4a9msvs2r1cbo7kflv4/sotaxuz.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60da44338---52864325843.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21f3f28d6---kidupaz.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f565ad35---75953806242.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ace48189---vizoxirafijup.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4411b9d5---vafogeligurefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=casual+blazer+style+guide
    • 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_off0000e6c4.bin
cb85331f7a0d0906b3871536ac1c37cdd80128f7eb6d3ed78e5fc410616a8a21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5192 bytes
font_01_sfnt_off0000f87f.bin
79ab04e6feed96e9420aa02cc609e7f8e676322f9da4e1e58cfcf00615541b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 10556 bytes