Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3559261f6917db4…

MALICIOUS

PDF

81.6 KB Created: 2021-07-08 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: adc36a7a40343aaa85be75bf6faef5fa SHA-1: eca021d68b1b229a9632e9fee08d980ab050f390 SHA-256: f3559261f6917db4f3b46131be0d3c791a3cbf0a3fba27cbd70dedcf1662dc73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a phone call, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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) or Microsoft license-boilerplate 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://synerhu.ru/uplcv?utm_term=call+green+cab PDF link annotation
    • http://nesemlak.com/test/images/uploads/files/wagilatidosuj.pdfIn PDF document text
    • http://geotersrl.it/file/dojelevobopedapuzodiwivu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6hr3v8ink1rrl5crcc3oguts6j/38337126232.pdfIn PDF document text
    • https://digicpictures.com/downloads/jomidufalub.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/55013077612.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/17519713595.pdfIn PDF document text
    • http://heureka-cz.eu/files/16754645581.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56859339450.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db45eb7f26---wavujipotilulade.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gj5hu3o689r9sjj27913ddvcl2/jexuzuna.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1fkd95omk0kdodgpt7l1fhf1ag/silolulifodoxugegefenem.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/27914074518.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/83938332010.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/11378486918.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/pukafefogezole.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/kelisojezizes.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/metizome.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a721a191f1e---50149046227.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/50535812973.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4e360b4471b3e737e94a2e7f08bcd8b/58096289359.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rujabozep.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tebibunixep.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a855f50c73546c90a123e55a9a0cd871/xujodoxolewudolikazan.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d9fc6ca9---27309648804.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/ruwerowutubumisusolega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2e82d965---wuxezexefili.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 17696 bytes
SHA-256: 41762b17ee924d050ca47659fdf325c0c61c55e4cf2cd69593ef2c8257b152b8
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 10096 bytes
SHA-256: dbd7fb883a79671dc7d8a5ca7a61f8fe2be0c7c479f7d4330f4d762a17fcdbcd

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