Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a340afaf340e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 08:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0f5e3082b5d69c0b8fab0fd3c5ac9a7 SHA-1: 060674626f662da9a6f16676da482e54e839ffb0 SHA-256: 819a340afaf340e71c18f69813bf5d7f05a85c536cf4340d204c6ebd9fddd0d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=road+transport+in+nigeria+pdf PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d2ec3f5e1214249923f383c024f320ce/ratavigizudotiki.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/otk0ev5g6ngd19t52vlc2aecfu/varej.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sapix.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/samoxaf.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/35232496265.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/jetumib.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/50299696093.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da65d05e1---43295481368.pdfIn PDF document text
    • https://o-dance.com/upload/files/pivejeragoluzezob.pdfIn PDF document text
    • http://dges.in/userfiles/file/84549573607.pdfIn PDF document text
    • https://digireg.sk/upload/2443086397.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/28010305104.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160881c00eccf9---garopimo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/618e8f993fa7d7f87477a3bf20b94fee/zodufezap.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9ctarr607710quqpkgmsec5ni7/bixikenurubuzusawav.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/kujeti.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86d0a3151---wipusokenalotavuzasenulu.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/fovuwuvasesigogosuw.pdfIn PDF document text
    • https://matratva.in/userfiles/file/rikinakojuruxobaraz.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/faniriwuroxakidifotenuku.pdfIn PDF document text
    • http://tyextractor.com/d/files/buwowaxopexuma.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/bisizodu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26644404896.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/vasabidenisiponene.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb17020525---92463666841.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 17660 bytes
SHA-256: 1131580c65f1f3964eb3e0e77685869a024e5cf5466dc29aa84937678413fb09
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 10672 bytes
SHA-256: 88cc04e1f3a3f62fb53a6c4ab9167118d18e5debe2ca53f18858ff0070a17c82
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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