Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351fcf03768a352…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 07:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdc683167e6ee51811690975e8819480 SHA-1: c5d34e91f3c4f4078a8d814c32c6c76536f5ba05 SHA-256: 3351fcf03768a352d5ea25bc80253b069d66f08f06bc2094cfe71002977aaade
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. These links are designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac354470a---rigatude.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/jabasurod.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/be8e190dfbe8c7f6c59f98382bb73dbe/vadujadinajipe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6cut3ng8tpg068206lohj06k23/depewajat.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lt8d03jhgtmakjtpdkqv39jlh9/musupejepunosif.pdfIn PDF document text
    • http://prestopc.it/upload/file/46018723129.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/rebedegokalasejigewirod.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805c3d785af---tipuxotidefowafepifotoz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaccec6ebd---tovituwominowumeravoz.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/84248444279.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/75935884947.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/17b72b0aad6858c683e4481321348df4/bibulanufigafapupifaruxuw.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/xozakazawexizunamope.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/riwulibum.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kavojute.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/gokadiwiw.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lavavupotujavajagol.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099db09cc215---zuxibajip.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f36298e98---83586998448.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/87502504868.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2343de6b447d6c6de5d9639abb80b6bf/43469703585.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/70558017142.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/46641987356.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741d2d91190---xitolegiwukojafoxa.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/22980970449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=quran+with+bangla+translation+full+1+to+30+pdfPDF link annotation
    • 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 20292 bytes
SHA-256: 3d151d5539770c1d438e6b005207e46a85ea777fc61a5ef5c36d229edb4da65d
font_02_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 11376 bytes
SHA-256: d28fa1184565557d222d8f952af1f5df681058e0eeffb3777c0296b6c4711930

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