Malicious PDF — malware analysis report

Static analysis result for SHA-256 d315ec4792f1054d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 08:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 985cec05697163bb4ba98fd57cae4bac SHA-1: 0ffa498c947651ed219ba1c0f61b8946a8568e0c SHA-256: d315ec4792f1054d7f6da6484152b6e3f11228c3298b96dad174fcca706fa96b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'callback phishing phone lure' heuristics indicates a potential attempt to trick users into calling fraudulent support numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=real+casino+games+for+android PDF link annotation
    • https://conrays.ru/f/data/58694355133.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908021255.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/15090791645.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/76199589815.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360db6645b8---nabunibedosetamujalusagiw.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/10858934499.pdfIn PDF document text
    • http://www.bash.cl/media/file/gerevaxopafifeseg.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jepamorezuxaju.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cec84186a4---43899237089.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73698220645.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/9255690689.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/kibepijikijitol.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/21148567950.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/41259371225.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1eeb8d8d---rulofuluwazefemifebaxuso.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5653dea91a5ecdf326d400b9d3f3e8b0/5804123112.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/363a6f755075fd9515aa3aa26fd0e3ca/pomujelokod.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/jeletujar.pdfIn PDF document text
    • https://etadelloro.it/images/file/povunejomaripif.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/detederunaxarevimokofexik.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/13508985057.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/42608168550.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/82151384147.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914081129382820.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/30918025085.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/lijopekavaxerulino.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/64870852384.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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 10768 bytes
SHA-256: 5ae3dad8e7fa876676edc4495a6973798da69109fd853e9f24c9d71e93ebd5dc
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 17628 bytes
SHA-256: bfb3b0def8ec37d09bf871b12511f2f6ffa9b127d118fb63084974b40f2df38e
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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