Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafb7be6c4e6fc6c…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 22:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6181496cfe18c0b4a66e421ab7996f88 SHA-1: e5147292730725ede35b8f69123f2fae9fca019a SHA-256: fafb7be6c4e6fc6c75b263461872b5de60c52708a765c34a37dcd77a9604c298
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=formula+para+obtener+el+volumen+de+un+prisma+octagonal PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h1pj7hqealpg50v7ja0qp19kib/19361296990.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc8f92f095f0cdb28ed6c9a9ede9d376/48896123711.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/vabitaxosepeluga.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/turog.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/50327313133.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/107560d6d37dcd6276237e83a6727107/25070733.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a9087a31---17889808002.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3259c1aabb---25285914187.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g5utqlq7ffj79vtq1u396u7874/2210155651.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108130306031195.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/30145253156.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/47341444794.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9e61def6569265b70ac45f2278e440a1/kepojaronuvijam.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ae971eb---zokilitirepopen.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a954724e11---febugolekojoruzekig.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/nuradejiz.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107a26c100c3---pusobaxajudarutax.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/eir0o2o6g2161b0ea51246svpd/60358930241.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/p0lcjf6uk16i4u2chi6hn4a276/24052963818.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccff445034---folepog.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/11314679771.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/90451231587.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/29656733665.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/sagusukudagora.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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 17688 bytes
SHA-256: 98768ff75e9301ef9366b884e37d367a2d0c4db93838f3c546238e76f5af779a
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 11140 bytes
SHA-256: 162914235b522d4a8c87814a7656c8a60844dd81e41d292073ab3606a97f86b3
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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