Malicious PDF — malware analysis report

Static analysis result for SHA-256 32afada5d9c76d4d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 07:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f72789c68386fcfe23f0a5a877f7971d SHA-1: d9bb7564096d714d467cf58e8fc7f301d7b1c6af SHA-256: 32afada5d9c76d4dc0c5474a97ed4d0c667a21b05450991f84af79b261aab7ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF files, disguised as utilities or converters. The presence of a 'Password-protected archive lure' heuristic suggests that the downloaded content may be encrypted to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=converter+para+arquivo+pdf+online PDF link annotation
    • http://www.s-prom.si/fileupload/file/96836116924.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/reforivisa.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/96588950617.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3d4e7c53---31269887411.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/36624337282.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/631b56eb2475d97b256bb33e9289b104/xolak.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/56599832828.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/kovanugukabebojukagajoze.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/10628683958.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f82d5171de0---wivujifoto.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7b58b3a26c0551bbebd72c3a8a783e15/zezofofexoj.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/sozeji.pdfIn PDF document text
    • https://digireg.cz/upload/99929761146.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vumujod.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e2277398---42420377069.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/06bb11bba0497f162bc0f672a5b85d36/34456375970.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/14738599910.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/8134001930.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32568159579.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/rokelokufasipawoteratu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/91b559f50c4b9a911cf8eb25fb0f5048/74612426446.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/davakopodij.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/37949180982.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bjtmj1ib9sdjshc7dqjh9tns20/kafasuxagojugomom.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/wejume.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/742nibfubap8uqdff7vntl3hd6/jaruke.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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 10664 bytes
SHA-256: 0fc0a8f894cc468edc452189a536f6c62baaf93e8bd5b61096b8e4d109a82a3a
font_01_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 18776 bytes
SHA-256: 9fdeefd0b4aea715da9541681c2cc87bfc1366383cf79c2773665df0528b841c

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