Malicious PDF — malware analysis report

Static analysis result for SHA-256 96af06eaac7c97d8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 02:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc108daa6e7fc23637c43c934190ceb4 SHA-1: 483ed1c4bc026eadd4e223e4b194554560d707c5 SHA-256: 96af06eaac7c97d8d6f6d7991b63c377c1b20c24659a7003406f33b2ede7d17d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=tap+tap+apk+ios+pubg PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130df7923b68---dutezipanefa.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a945fafbcaa08000aca71cd81a3d7cb9/nikilugas.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/zogumipoko.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/97031979889.pdfIn PDF document text
    • http://elsped.hu/files/file/warosijasinateses.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/lironipemosadimatizokem.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/80417770453.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/81455420323.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wawes.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109031013581482.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/zatisefodudekidoreb.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/71306783209.pdfIn PDF document text
    • http://baoveantam.org/upload/files/6068549347.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130443055e65---litivanun.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/40021365686.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021301349327.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb3c92198---27802139843.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109171524043137.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/56552819820.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/92602084239.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/88638908073.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/77978618918.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/gexazinavawuvonolabos.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161305309323d5---vopuxeliduju.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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10340 bytes
SHA-256: 2c0f54f9e3f3ac57ab9811b67345229750e0fbc945228954cb1c387ff1d05d27
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 18256 bytes
SHA-256: 582a03e847b219ca88c9f3b75f37d004b5923c036a1b93ec4efb428e711394af
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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