Malicious PDF — malware analysis report

Static analysis result for SHA-256 310941fa31cfdc80…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 22:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48f3607b93d28f8629280c10a73bfee3 SHA-1: 915e8276f0ba3a17c470c9863bd437cdb961d15f SHA-256: 310941fa31cfdc807f559c493ca5d46b6fb4ba1e09c85ceb0e3edf546f7b0865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=2011+nissan+juke+manual+book PDF link annotation
    • http://leoclubmarsala.it/userfiles/files/naxumopelidajipatilivu.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/relozexuwekomijefimesil.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/76741724727.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/wadetugisagetezozi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/44886340181.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a016b6a098---13331242159.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/73469403846.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/55584328249.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a799b6f7---66329812962.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/66221368970.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/27917c9bf5c1c3faf8ddb586bd6689df/vivuxotev.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/tubede.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/gixul.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a66c6b16c---56699062737.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vuwababudagadulamameku.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/84343197626.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/50357681030.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/97147881317.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jakidu.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/giletulogipig.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wajanobajojamagizirogis.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vuwakulijo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0ba164e0---jivelofomizafebapo.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jigelemepobuxaxezumer.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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10728 bytes
SHA-256: b411dfbe4afc6c85018db418f3a5027befc0a8f0d45c691e35dfbf3e98a1378e
font_02_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 18732 bytes
SHA-256: a81285bd137c6e84d19fffd5aee2116c3a89849aeff16801bc02db4dd5eada12

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