Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d57395924e0617e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 20:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36d669a86684b1a2d3b54ff841c63a11 SHA-1: 8466ecb6417e017f301941d39de38cb6aa00db0a SHA-256: 0d57395924e0617e937a428c48392d6e9c81a47d996081b7d1f6949dce9b6390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads. No scripts were extracted, but the PDF structure itself is used to host these links.

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://laborke.ru/uplcv?utm_term=minecraft+0.15+apk+download PDF link annotation
    • http://mlead.net/images/e/file/72624470303.pdfIn PDF document text
    • https://matricula.arendic.cl/files/23809557174.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/31179989864.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/070c8f80a173829bb42fcc4676727143/risijivopodi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/88601734819.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/nemoxunolof.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/43517889027.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/68469896208.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/97155750351.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/it1aumpt0ou982pk2c43v0u1ke/galefo.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/15231917145.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidibuwelibijumeporusa.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/9624371180.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e20f6d4849cae38c8245acb8b29bbad1/mupip.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/83155447976.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/nepatedorifeguwapezuw.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/zimedikajetukut.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/9527585146.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/32432130816.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136d43dbe20b---vatejefif.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/gulelaradajajonifoviko.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191124404740.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/wobirizikinonukerisis.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dakapasija.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_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 17340 bytes
SHA-256: 696397e775ffc09df53bac80d81f49d5508007ad1aca7bd3b4bf32aef38c4e6c
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10988 bytes
SHA-256: ccde4d83e4f4584a7225e5b66cc03bb6f302be4da3b226075e1cce42e4edf29f

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