Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b286d2bbaf84c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 06:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 066196b1c6b030cabeae0c422fcf7705 SHA-1: 6cbc3f4681d0fdeeb8d6158debd2e9cb7f91d92c SHA-256: 8c4b286d2bbaf84c3901624c19a8db0b6fb93df72c96077543774dbcef170b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=social+psychology+concepts+pdf PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/semexixomisijijufitegoza.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tagonodivepe.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/24456957796.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/zekigofizotojejem.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/35786428552.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a378a8d1178---rumidigaz.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/37405334985.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e01ab0a427af60519b74cbfc8e1b0b23/jujugofezusijerimuwuk.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/11927346405.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/ruteteretanopiwimavozaji.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xajanugixev.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/31067076289.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ba27dc3b---93353171839.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee49a03a6---28093601658.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/tikosobi.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/49463751576.pdfIn PDF document text
    • https://magatek.com/documents/file/xoturidu.pdfIn PDF document text
    • http://www.toptehnik.si/images/wanorolivovolinexowefusot.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ed35cba1a94954263505d264509eaa39/41190851998.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/85358076856.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/faguzuta.pdfIn PDF document text
    • http://446888.top/userfiles/file/zokuza.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c949aaf58abeefefa25041753a3f6d0c/99311955796.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/12843952947.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aqsgo3apsa86n12vceokgmb8cm/gukela.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af521c0d5---jupudamodedewimevamutexe.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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 10988 bytes
SHA-256: da32ca879dfeaceee45022c2523038d3176a8a1d9ab62f72821f7346b25c83a5
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16792 bytes
SHA-256: 6d08722d8659f0122385ad40a11c532d46c174e93387d72b821a3a273a43e4ee
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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