Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbcdaeed9873cba…

MALICIOUS

PDF

94.0 KB Created: 2021-08-11 17:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba0be13eff273e9c103251b206555375 SHA-1: 3eae9e379fdc12a759fd194e4cfe45f5f80d70a3 SHA-256: 6bbcdaeed9873cba3b287a44030221179065a280dd42cea137c5c1ef61cf6ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=total+body+gym+workout+machine PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dbfc7305b---56345554673.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d64fe50f7e7---3738861441.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mubujovudunofe.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/remeguz.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/mowebadusaxeku.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/13875350813.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f790cd61bc---10519829177.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/tawugitexuvaviwomopixodab.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e6e5acb63fa---32944801837.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/bavitip.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088904598a7a---43337581280.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kusebotegosuwiraguviju.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/87694699197.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb446ddde---58251702986.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/geruzazilakuj.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/42542735450.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1lhamekdhc40cdfcglskt5nafu/tokafega.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/xivemijofuvejepoxitobu.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/19466164296.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/43511404116.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/80a7491f464d7073cd31be4cb37733fe/xataximunivu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/83076b5498cfe871bbd5dca9c4b584a8/79019337610.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a189685873---88734868005.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lezifedamirod.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/damuruxapagobujobowagemi.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_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11144 bytes
SHA-256: 077347c5981b3a43c2e08ce1ef2823473f2cba877faba1a842d4d153f12a46e8
font_01_sfnt_off0001243a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 16888 bytes
SHA-256: b81674e7c2adaf2680ddd3f1fee8ef3a91728cf42520e888a72a78a633a6832d
font_02_sfnt_off00015060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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