Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8915473c2d8041…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 08:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 537406402c8071ec428794b4856a929f SHA-1: c72f795ac1aaa4e3fc590a21a9c839427e39add8 SHA-256: bd8915473c2d804119a027ca9d0d9ae5b5db81385966b18c1b43e858baeb04ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=wise+men+talk+because+they+have+something+to+say
    • http://svaz-podnikani.cz/files/file/21458740302.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3b07c850b940485955b40bf0bd2cb458/dixikefo.pdf
    • https://mides.vn/images/ckeditor/files/71444787324.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210626_42A2A6ECEC061D0E.pdf
    • http://eksan-ltd.com/userfiles/file/48461601437.pdf
    • https://lionkingbali.com/uploads/file/1432860286.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd17a25a4a1b0d9c9f48e2c09478e200/rarorevoxaludegul.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/nafinogenufatavivoku.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8d6909aa73cb80dd037ed680f711006f/55408289458.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dc0f18e1---menukibupupimamenik.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/af9849ce4f7b06ef7a425bed0d5e328e/95135729163.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739553ade70---35059471475.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1714ef36b8---viruvifokoxidosuzenewiguk.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/veselizabimujurapefi.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/61925223105.pdf
    • http://apexnepaltravel.com/userfiles/file/setux.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c1015d94---51513704012.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df552e53b0---marufusuluzo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098151aef9f9---13505067586.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/k4nq9u4buig5bj8c7rjsdgm2t8/91732098543.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce29073fd04af6937ce69158a0e385fd/vadekadipeg.pdf
    • http://lovesushiscv.com/uploads/files/kitisofaxowa.pdf
    • http://rajskiewakacje.pl/userfiles/file/lexewuridusigedej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f697.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
font_01_sfnt_off00010eae.bin
ffb66b88dcd0dbf8897367ada1d83c27e6c11a569efd5ace4fdbd9d99d744c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 11084 bytes
font_02_sfnt_off00012867.bin
f5761346d53be9f233b2fabd433d961ff38ea5c509e5f8975fff0cd732416e30
pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 17624 bytes