Malicious PDF — malware analysis report

Static analysis result for SHA-256 7926949c8a525108…

MALICIOUS

PDF

80.0 KB Created: 2021-08-15 11:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 567ded19d64437d035a8047464f3ff30 SHA-1: 2a9969c1f52add9a5962b522e89439386ba20571 SHA-256: 7926949c8a5251082b2267570cebeb54e5b3bd7b1e00646d57f30227432dd700
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicates a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection suggest the document's purpose is to lure users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=sades+one+handed+keyboard+manual PDF link annotation
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/dusosaxese.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/784a911751ece7b5db857d99f654b03c/jesagux.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/sisupuzivamew.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/kewojam.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097c903181d0---runudon.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/netakakuwod.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/20071609070.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084312d544c4---52082233735.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/37220185388.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663408caa5---nemewevolusukonij.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/91236693903.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/49523653363.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b837137a6a2---xexeziwadusavaxo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dvcttg048es69biitten1nr5da/24585424543.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/17824726390.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/48526029935.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/15092302956.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fifeguwotoko.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f0fe69501---xilamuzupulubezimine.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/88895837191.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdf81c48e0---pusavudikakasawazanolalur.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/59664828437.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 10844 bytes
SHA-256: 7a3ca2d0e918f470d24558cd1ff4646d4c3f1a013557009d4fcbdf05e9009269
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 15292 bytes
SHA-256: eaadf163dbdd6eeb4a5e0a8ec6da0055387cc3b315923ac61d0bfcaaf0f3e248

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