Malicious PDF — malware analysis report

Static analysis result for SHA-256 3151b259e4a8a024…

MALICIOUS

PDF

96.8 KB Created: 2021-06-29 03:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3ae126a9bb99e27843160e4d44dc533 SHA-1: 698ec6dc1deab82f930045dc44728ecfce4e88bd SHA-256: 3151b259e4a8a02432f0602f7f940be469139e8bcf6983549b14541f69c48e55
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which are hosted on disposable domains or utilize compromised CMS uploads. The PDF's structure and the presence of numerous external URIs suggest it's designed to exploit users by leading them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://crysiq.ru/uplcv?utm_term=welding+engineering+and+technology+by+rs+parmar+pdf
    • http://novussiteyonetimi.com/uploads/file/levuxaledaraveru.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c2d6e036---xaludesedafa.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b1321941---katonawewo.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pipipumixifelirakofef.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ebf8ae30---nikupivibinuruli.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae91bcc0d---9257986694.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/jugibif.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d3a2ffa5---lafobovuvoxixejo.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc01049530---kubatulixima.pdf
    • https://speculatio.in/ci/userfiles/files/96565896782.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9eflo3i1kfhrpeec9ku9j9tnjd/31853777975.pdf
    • https://alatheir.com/atheirwsfiles/file/kopifiralujo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9bdc65f2---98644862189.pdf
    • https://m-isc.com/userfiles/file/govalulebutuk.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nacf99ffjtjg21fv7104c08lve/20770143798.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47357ac90---navefowusowot.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/ramirifidojosokidetuki.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7da0c1ff86---winoxerusudojexemi.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ab04289e---tozeliraliluve.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11e32308c---dugetagupuvowoluf.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3540b9d501---45063723963.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/23817789271.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d526b853f---sivodalesele.pdf
    • http://akinmedikal.com/uploads/file/86388671461.pdf
    • http://dlt-nkp.com/fileupload//file/rewibi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000142f9.bin
fd27999d2bc1e41c23eeb2b0de19e0a08aa007734f4248ab7d2c321153b3e8b5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142F9 28212 bytes
font_00_sfnt_off0000e50c.bin
259180292d746ceb6a218a46f48e2c09629ff0a19df0b263c6611289d79fa568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 11312 bytes
font_01_sfnt_off0000ff03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 16792 bytes
font_02_sfnt_off00011715.bin
fad88e67d3baa303fc75a7726f9c4c3930f6b0266f8b89647b968cba452daeba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 16988 bytes

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