Malicious PDF — malware analysis report

Static analysis result for SHA-256 d612d75c17128c12…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 23:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6bb92bbc8b2e6996c6233897e1e04f7 SHA-1: dbb1061ce10f559f0d0f8af8f1f802f22c830534 SHA-256: d612d75c17128c12c4a35d6aaf49ef88c8325b3b8dd9028fb32f2e1dcc995cca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly suggests this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=inds+ios+emulator
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/13adb3d89e3f8ad68881a353c2e3bedd/zenusapibosugikowiba.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774046840d---kuvivoxa.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868dcfac894---9974908931.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609177d0d1f13---liriroxunukelize.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5e06d35c---robesinufapiwilaxakateg.pdf
    • https://ludifrance.fr/userfiles/file/fopatowanitojunogoponize.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9e94af4a---46065122508.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bd333290---85441220672.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc247f41f---nabokeb.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609405d519244---tezov.pdf
    • https://cowichanseniors.ca/userfiles/file/kifomirerifavisolowodiwif.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a07bb8a4---67993117469.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b441b656cd66664aa4fb31de417d0134/zebibitavezewapafaxanu.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l2gl97bqteitf3rg82lm9s6dop/lawowaresazi.pdf
    • https://securityguardsupply.org/php/uploads/file/16241373134.pdf
    • http://ciaooo.ru/uploades/userfiles/file/bojeluto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e9b2.bin
467b384245b0ff2d7468e8ac9cf6ff4e656d3a484f592526a434c03d89e6bdf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 4908 bytes
font_01_sfnt_off0000fa46.bin
ff87fcbe573824b9783a675e568cd6fff4821cb7ef605d8e6577b1b032a7c97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10888 bytes

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