Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bfd5fec3b774a9…

MALICIOUS

PDF

99.3 KB Created: 2021-06-08 22:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7cac181c691236c94c1363e7ad0fb40a SHA-1: ecee22e7c70daf6848506448f732950574d8c881 SHA-256: d1bfd5fec3b774a905228b47bf7c68f127667015510a92b92f05d74bb3a32a0b
156 Risk Score

Malware Insights

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

This PDF document contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm structure are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=ending+tasks+in+task+manager PDF link annotation
    • http://usaoxin.com/userfiles/2021-6/file/92128739553.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/32144464469.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/27407405137.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f878d891f---77406430125.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e728a240c394e360e4c2869bdf95eec0/15878427240.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/pubuluwuvesepafogi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/52681a0eaa4346644ffc33fffd7b1efe/30252883834.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc84b63f08---71633606048.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/mojuwi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f049e8f5f2afcd40fa4fa669a092fd5a/47782410771.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1dab4b169---kogop.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e6ba5c1a---83921125835.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b0335111987d93c81a465addf4a18df1/ritigedezobiberuw.pdfIn PDF document text
    • http://palami.by/images/file/weboxewovuzetozut.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r652are653sagp6o10312l7el9/85108677255.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/233d8f039076da82ca46a18821bc17b2/33888354109.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/00a9ff69bd1cf5bbe7ece2ebe3419ffc/37794624919.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504020140_1943944190.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_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 5132 bytes
SHA-256: 502b560cdd9deb5da3b87a69341106d1013e050a46433a7c9459e6447739c778
font_01_sfnt_off00015893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15893 10856 bytes
SHA-256: 180b3a65a2ca8830065431f1be9a2882dcbc07bf252b232163c21c5cc9299d0f