Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb51256fe87314e…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 13:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5c1b0470589effbff4e3dba94843e69 SHA-1: 2e7486e2c60f6137cfd14efc7d5b8d580169b3f0 SHA-256: fcb51256fe87314e13bbe0a15f36e95ecc9135380f5a54f878fd99ba6462f0a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://archism.ru/uplcv?utm_term=indigenous+games+in+zimbabwe+pdf PDF link annotation
    • https://vietspices.asia/uploads/files/52548615517.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/jubolisinorefewelalizarav.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/22614347184.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/61679089125.pdfIn PDF document text
    • https://temahr.hr/files/wopojis.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/wikok.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085612feea6b---11438089421.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/60464035620.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7c726c12---42307112671.pdfIn PDF document text
    • http://itfind.ru/uploads/file/jamekevoje.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/84674402272.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/30399258374.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/satap.pdfIn PDF document text
    • https://digireg.it/upload/gupab.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3f426347---najewawozafuveb.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/88590522934.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d9f0a257588abaf9b10ab89429a16ae4/luxufiv.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fmp90gq1uftbtq4959qbk4qaa9/xukozonofusigexufaw.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kivamonelusaje.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/57497078273.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/fotumiralixolifodexet.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d1cb1b1---7162192137.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/6590284565.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/m13s5kmr6iokc6aknbkokp6md5/62292386203.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/u5ftvs9j8qu0kschmfbgfdlmdd/70688369828.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_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 10936 bytes
SHA-256: 53437bad9b09620381f811dfe4d15c410d52f38e5ce0e72a02ca39ad6ca4baed
font_02_sfnt_off00013336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 18164 bytes
SHA-256: 036b0f13fdc558b34a8442f928ff6d8c3545e2dd9ffe9d947b53d619b1ae232a

Open this report in the interactive analyzer, or submit your own file for analysis.