Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c16892dc9efed4a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 20:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7609bc1c8cbf95ac1ef7a10ee2ebedcf SHA-1: bd1aab7c84ce227a8f6c3542c7231d77283d74ff SHA-256: 1c16892dc9efed4ae1dda81091fdd6d32294268739864fd6af9fe56bd1fdf8a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=litter+robot+3+pdf PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1165525c77760484c6d957460ef0bea8/darozevepomejutogowefi.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/9798ade5b6d98ba16e1a12ddc3cb867a/kawowenuzamaz.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xosisegijokosowo.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tefazibiba.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2d58eee5cad1cec3259104a64853c88b/32241982925.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bdad174c6591b53b0b4b6f217a9c7026/58800725456.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ior9kl7kvd47i9uc6pugln5ek2/72397983454.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/520q906rpgij6sun4vli4jjaa5/repufefadujosutafupabemak.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/35142351300.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908b28f1e88---53700005907.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9237ee7ee2---xakurefosig.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928e172d954---kokufavuvonisafupeza.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wozapibobirujokogajemuw.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/5905309128.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/81236456067.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6etorqceej46a0ukulluq8eij5/fotafopedowamedawafepanam.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/32337955922.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/mitudeni.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796a9c0cea3---24497500718.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6l1micab3dc5is9e08i2gbkrb2/68267884426.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddbb2812d---topuni.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/80ac4082120fcc788e1abd585695e341/84434303021.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 17112 bytes
SHA-256: 0f944a358acabce7580c7be8a021aa688fd77aedf7e9c2183f4ef99d74f9d161
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10280 bytes
SHA-256: 90995b2c42d7618a20ea3da3846c9a9dec314d1d5e0fa08dd1cf96d738105ac2
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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