Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c4106ebe7afed2…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 21:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23ed55e76deedf3160fe5f9cf1303547 SHA-1: c6108123c8d4e86339dbf77dd922eac6a9e3b58f SHA-256: 36c4106ebe7afed22eaa08667c8f0afb95d0d123df91ce15515acf454a32319b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous links pointing to potentially compromised or disposable domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'callback phishing phone lure' heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://meble-tk.pl/userfiles/file/88679727877.pdf In PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/91628314502.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/5280257876.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/86753649774.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/71895306253.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/46100457323.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079b37e5297d---73469444762.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7002edb3f---32759565379.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/badivu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c425bb3a8c1---misotonuru.pdfIn PDF document text
    • https://baongochoa.com/upload/file/46837564342.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f01b47b7---dudidafevejonufenemar.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/46870854197.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f37496c008b460bb68bccfd1c55e2d8a/gapirulu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8107d4b6---vipadiren.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9168ad5d2---46120916558.pdfIn PDF document text
    • http://fedime.org/imagenes/jumixuv.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/80031527945.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b809cad4b---dazifusumajapikizaxavezol.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/71837631039.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/17906695987.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/86778383806.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d475de34a82a933fd3ba331e068bd3c4/62056339657.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21b962f5625eeec8d6e040cd31d79612/15918710696.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/besomeluxese.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/regaxivorup.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7d1d913a---zivujufowarafuzelosipinar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=attorney+general+consumer+protectionPDF 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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17420 bytes
SHA-256: 4ee0178de83945766eea3e6a69731cf69a5143cc32b356ed5c74952a16a85265
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10912 bytes
SHA-256: 1386bfd8b4cce3b1d5e81f7c8355a60199c0cf59038f9c08738fdc7de3e7f593

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