Malicious PDF — malware analysis report

Static analysis result for SHA-256 d295a0620c40f894…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f681f373e2dfecd8e727c999366b771 SHA-1: c791d594492c3b8170e96674816fae6e1376e958 SHA-256: d295a0620c40f894a139cc4d2b585a0178150a0b8471859ffdd5478f0baa6c19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for a fabricated issue. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.
  • 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 http://messtores.ca/fck_user_files/file/20179438173.pdf In PDF document text
    • https://xosobacninh.vn/webroot/img/files/30278316844.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/veboxuwekarigubefo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/maxuwa.pdfIn PDF document text
    • https://tuinvandecruys.be/file/24470705090.pdfIn PDF document text
    • https://lapakunited.com/contents/files/pajiwom.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/211735860.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bda56267a8---51539706956.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/89447646904.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kidimojukezivize.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/lunumofokezafokebu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/bd43e66ebbd251d159c5c3fac403dc79/zidokajexegomatojuxoro.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76433f975---20778793393.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dofikuvutik.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/kikuvuzodiraluvigurokufo.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/sefazifot.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/jerekitadirirusotewojo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161349c8e95682---vibisemeleretekasekuroros.pdfIn PDF document text
    • http://esejsc.com/upload/files/xiwuseti.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/65f6897e89f0a8656475f47b8ebc0853/51693837105.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/67956285341.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/89014076270.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/tupukodoviwojob.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/lulolukugopibave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=widget+stack+androidPDF link annotation
    • 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_off0000afe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 15844 bytes
SHA-256: 00683423bb7dfb07348446aedb3c67259d4836b530bae5de556da6597be75924
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10584 bytes
SHA-256: 121d2c9ca635c80a74890b44b71077b862a19645ac17d04d72cd2326f62f2807

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