Malicious PDF — malware analysis report

Static analysis result for SHA-256 86859c0cd56e6b12…

MALICIOUS

PDF

147.7 KB Created: 2021-09-06 02:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fe8e7d6b1edf813d72e44ed3cc2bcf1 SHA-1: 3d649bfbe5e809f862a6206654369ff404f962af SHA-256: 86859c0cd56e6b12428e10ada20ba62c6f36f1cd9147ae39835963148b1e66ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to various URLs, many hosted on compromised WordPress sites, under the guise of providing educational materials. The presence of multiple external URIs and link farm heuristics suggests an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://nomylo.ru/uplcv?utm_term=durga+sir+java+notes+pdf+download PDF link annotation
    • http://azbuka-d.ru/ckfinder/userfiles/files/zakakafilibutozepetud.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mitokevavomolo.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/faxobukiwiw.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rigabolividevit.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfe6c65bd---wirolojulupodogolot.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/32832732762.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b00ca99e1---79337979114.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607248076df3b---74912322866.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6625a90ad9---mivipelusadamew.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/326323391.pdfIn PDF document text
    • http://podarox.ru/public/files/lelawusafujudazane.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/baketigewofuziregeki.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ed08f96b5b6e08faeb1d2bf479a41602/13988815976.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cfb141c5530944ff54835b68181323a2/pubeferokofotirolav.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/25757901166.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/68686544315.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/41961004475.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/86387774818.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523003259.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161034bf0a9f14---60189112194.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/57267818830.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1a2bbb10---60196485445.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/tevusan.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/5217583823.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_off0001d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED2B 21940 bytes
SHA-256: 5e7dacfaede921b13bc13e2733de295a572f4f8473f14d79c3db162e530399c1
font_02_sfnt_off00022767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22767 11056 bytes
SHA-256: 844d816e5acf6898196cd30d6d62fd04efde032f859b2f2edb14f0c719890967

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