Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9492f8cc868ebd4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 18:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e59672567a20b6380dbedcea2243737 SHA-1: 9bf316c5c7877108fc077e46e1114867c1a2e103 SHA-256: d9492f8cc868ebd4460d3b700418d507ffe4b433d8d1a5cd38b2ca5b06b2b1c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms points to an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bee12515680d979999d84f5697f3952e/92097849214.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9109af7f.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/mavikamurumopemodi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/73596932835.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/86695335296.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/51b1db45b1f92dc321ae763d302fc4c5/pejupu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/zabodabugidadovumojosota.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/makidutekesobuboxuwudiwig.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/somixavu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/6586820626.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/40404209213.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/59647925807.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/bipak.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210915182025818.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/kikaremo.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/vakoruwoma.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffe15043f---gevimutevumelokeganaronat.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/munokedeforupax.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/vaxiviveloxarinagu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e372c25580---23319288968.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/34413079421.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/dovefoti.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/rerud.pdfIn PDF document text
    • http://pvvc.cz/files/6993284357.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/fagokazasejemakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=can+facetime+do+multiple+callsPDF link annotation
    • 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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 10812 bytes
SHA-256: 27ad5f39d01c5d63a70cd7271648386e643930cd2d270b82dc663529dcb5521c
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 17408 bytes
SHA-256: 99ce19cb56ce6fac016dfbcc35817b9505a0972624f77bed650c8ef3a96213e5
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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