Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c84ca15c0508b71…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 11:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 399a7a761a0df6f037f91dd4697008fd SHA-1: b0c12234854cd18d15fc277d4e61f011a3779c3a SHA-256: 7c84ca15c0508b7127f247eaadbbafda3a2b1e7b2ce103414305840dffdf7b4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering to redirect users to malicious 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://cructi.ru/uplcv?utm_term=odontogenesis+gigi+pdf PDF link annotation
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7872d91345e2a917d3d9eeadf9d5aa99/defosu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062323490526.pdfIn PDF document text
    • http://sartor.ru/upload/files/29662784762.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0ba57ad965ba8c60b6fc24144efc9b07/81004816792.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/32832495037.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/94482599619.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///4915054884.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/45037826915.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/52657720928.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zoker.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zujurudu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75846205ad---96589573731.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d19eb52cac9879e7e57587c959195d8e/lijizenofisedomuve.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/lokegiriparomuf.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/23180694238.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/voripomive.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b979ee32a---75700450379.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/xisifed.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6e053edb0207350bfe4fe81bb4bcd243/44080197389.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084787496f54---wemojudu.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jiturudanejojusokebelapi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/63180622306.pdfIn PDF document text
    • https://numberonerevolution.it/file/13990848360.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/22895792217.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/t1q0fpv7e4444ksq2atpssk8fu/jomaxugas.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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 10388 bytes
SHA-256: fabfaa248f7c76bcc6422428002c647609d58247e6595319f42441e1cef55e22
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 18364 bytes
SHA-256: 5dcce0ef94c838e2250dde7a2ab8feb50eb876508fd9d4297de6ea7a660d3f8a
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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