Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef3506dae6f2cb2…

MALICIOUS

PDF

70.1 KB Created: 2021-06-05 02:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 43a6fc1ba237256b2ea39afbb4392fe9 SHA-1: 345e47e56736a9e0d6d3d6c8aae176520c760859 SHA-256: 6ef3506dae6f2cb2a7dde4d3251ec55c3834d85fdfafaf89ba2be95a72af029d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=how+to+play+pokemon+fire+red+on+windows+10 PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de6953e62---48213335495.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccad3c181f---17865245493.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3841a636---tigumi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa127a74bd2---19079591077.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e7f730c43f0030ae7c2ce4d811134931/soradomurixopi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/21544695b8355222e46c481aea64aa8e/jopagawilow.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pegewetijemujoxufopuz.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e4a3b0a58828d24868bb9d1e15b13c44/takazabajejolo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6b2c6f085a8c6af688290872ee7d0ac8/xafudowexefowujojazawava.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/6385205409.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/597275a499cd133b5c670df45ae26141/litorixufeboruru.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/10039574330.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/48719317898.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/60276aa3c98a36f7bd392f7d946baf16/31406500559.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f0e6bfbe---nemowagudod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5600 bytes
SHA-256: e846989607c07af700199268af9a935cc9bcacf7db231c7a5906641fc7930d16
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 10588 bytes
SHA-256: f7a9dd3706baff5f616c081b304bcb6ece3072282eb845e3bfb3bfeeb30870da