Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ee61c2c4ee1a2c…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 00:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5562055a0b4ff2af6f93c54e32b6529 SHA-1: da0a811f226fa3532c839f1318f0ea14768b629b SHA-256: 26ee61c2c4ee1a2ca8a4d511ce893dd0e166446053efabebba630b78ff023504
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious phishing lure, including fake invoice language and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=cv+format+for+accountant+in+word+format+download+free PDF link annotation
    • http://proficlim.ru/public/userfiles/file/mebezajogabiluxupigu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bitemawil.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/815250d966e9308a8d143e44cabd023f/57243170204.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/davanugemumowavofi.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/15507330520.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/mupuxujiwabexil.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/94969884965.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/87862949007.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/23757153960.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/37427638978.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/67894906534.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bofinesuzoxotokubosirime.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f2be1b23---putulaluk.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/95832263713.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46353279664.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18121c5d8---87161987182.pdfIn PDF document text
    • http://greenld.com/userfiles/44205343958.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94279165358.pdfIn PDF document text
    • http://pololanna.com/user_img/files/45111872636.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/ravugupoginojo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ropagibalulipod.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb633aa690---xofibizenakulifut.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109031655442294.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/615572b654dca.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210913122652143551.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10752 bytes
SHA-256: dff1ed3cd6effe18b088d2c9be94de725c5cb6b766571e793bea8e52a32f890d
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 17956 bytes
SHA-256: 09141562e8834af826789ae179a0668ded3ec02254341e3e47e2e6489864b610
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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