Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebde5c629adf186…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 10:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48fd28e72beaa91b55d36afed9d81dd3 SHA-1: f0f3d168124d1fae1788e3118dc41b28f4e5ed87 SHA-256: 3ebde5c629adf18682abb138494be7341242eeb4bf515c5ca17e1a041324f674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=deck+of+cards+probability+worksheet+pdf PDF link annotation
    • http://vhktn.at/images/content/files/10560096649.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161158973cdfb3---modikafepasaput.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/87699219099.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/kuxutoxi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45a738919---zegirejub.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/tiluzo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/89893116826.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/37807808797.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8cac80198---bumejodajinejir.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/71b926fe95cae7f65eee22b48b791131/vifazazeruzinipinovubemex.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m03mcn5o1ss2l7iv5tjla3eb07/71089364525.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bf943cd7ce8e997cc6ac6c87e7c2298b/42281642524.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608549dfa6743---puzibusefomipegagifat.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/vetesopova.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1e0f955db299e49cf67910d4620730ab/gidet.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/mowarijuze.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bbeaada194633688aa3b3a6c00764dc6/fafeluximunorixulusaguz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080f5acc73ae---simazekejozipeguzinutoza.pdfIn PDF document text
    • http://digifast.cz/userfiles/52512124045.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xefimijamexoxuxakalod.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/mubomidasitagufelizemom.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60b8bad4b---30951520020.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/58751485854.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/48016598593.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51db6609b---dewibepagivi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m4ngefcavc1sm9feg3vlmshv81/44886768307.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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 11048 bytes
SHA-256: 8fc07e7ca4c95389c1139951ac34bcd2c2c922a3f20dd383bcaf6cdf658616df
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 18712 bytes
SHA-256: 95895170ac192ab87c63369b3b1a859ac0ffd5ef2ca601452f0aa13a4a6cad75
font_02_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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