Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a67a6392413df9…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 02:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2688b1eb91196b57c6800bb9c32f9298 SHA-1: 625039f5dabe6f1d4243217cea83e8349c68d464 SHA-256: b6a67a6392413df97462fe5dfb8a3b18a78b936b4f804ff0b46a56069b38b3c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f999dd09462774460714ec0b0f79859/89386886997.pdf In PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/maxudowagalufozosajam.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/37496846261.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d563a706687427be80aa01006df3fddc/93311479894.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/90700605859.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160766bd5c4937---nanurakabebeje.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b967069a4c---vakonomoxoturedifa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/295ef189aec44fec18eab894f442f25c/gotamilod.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/guligezazusinudozana.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/60177796592.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c033d0c5742---84147678335.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b0d8fc85---woruxabixe.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/60334989585.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/831a3d21b831bbac20fbdbb1e7346d11/60223646759.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee821303b---99536066510.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/butd5mhp4r39ea392kdcjdojor/17953286544.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/mamitejegenixupuwiwokunu.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/73036105436.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/fb8e5f76b8953afa0c9cf2d4ff879256/76423666827.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ace8ecc392733e62ec9134f7e59c0283/sutofa.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/50344358605.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tisivibe.pdfIn PDF document text
    • http://canoeing.by/pics/files/mepokasi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2lk0rplp1328c418fhqv3hrk4b/wusepajosotoji.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fabef5f9ed235a781d5945216c6180ee/19623108401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=que+es+un+lider+autoritario+ejemplosPDF 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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 10840 bytes
SHA-256: c6d94e2dd2ac439b4d4260173d5dcca9bf8da12e0b57c1d071bf80470f99b593
font_01_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 18680 bytes
SHA-256: cafe3046357073de2f3a3a19c29d6c771d9e4360922642a9dc87e9d59b8bed28