Malicious PDF — malware analysis report

Static analysis result for SHA-256 464a9c402a3369b7…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 23:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a9679c65467783655f1b37ed44c08a35 SHA-1: 765993d79c89989abcf4bac3aac9eaad72006ea6 SHA-256: 464a9c402a3369b7ca81a804f59617b3a61636955025b05fc2e7439742936a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=spider+solitaire+card+game+free+download+for+android+mobile PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p22f3pqivsrle2g3d01u8oajs3/fovedegenenosowatomed.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ee989ab0---93646892573.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/colk8kh4dvn1k457ea5nk62m45/8611760213.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/56ffa9163b2f8d817373ac8573ba250d/82828722087.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2461529ea1---30533367972.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/68467560681.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7975e59d---68015335933.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/nunigedoza.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/morotiguteworaxawegitomof.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a125a75a751---12514818158.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/65911591917.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f801f2c8---4015008009.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/19be6128a819ecab9f1ab8546fa74f18/40411373890.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/mofibefunuv.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fij9a3mjg468l8lg4rvullivt6/88023911283.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/tomanatevozawilet.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad43c2c70c---36882930198.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/58830012103.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/79759391268.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766868df57---88694755241.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9fcj1j09501pth24rlphqtv6o4/foxekexosuveguj.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e307cd806f177299e964b9e16d3b8045/44136415760.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1079e249fa---54458294535.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/37987482217.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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 11264 bytes
SHA-256: 96bf05258637229e0c39981712ae4658d4e0b1333a19f27a86792c4f725c9d0e
font_02_sfnt_off00012f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0F 16868 bytes
SHA-256: bc31fa7f33894f01e6ede612e03b1fc7bce9f5b03d6c4a510c7353ddeea8dd01