Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d24baa9639444d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 03:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b2fc6e4ab8e3e9d86d0078f03a9673db SHA-1: 0713629001f94e4fa6ebecaf140aa0837ae4fcbc SHA-256: c8d24baa9639444d5ff0d14a4f6be07405308f968e4822d2b4b720a8c400526c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or 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 embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=skillful+listening+and+speaking+2+pdf PDF link annotation
    • http://apvn.info/userfiles/file/62431790427.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/ninatevopa.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/36641178553.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vudimotavifobi.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/jewabup.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/bipopavukamozoxedorodova.pdfIn PDF document text
    • http://muszempilla.com/files/file/poxeb.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49b68ce34---kelupurum.pdfIn PDF document text
    • http://mousike.it/img_ins/files/1992557755.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161063b9beb318---48737082066.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kofituxirefabatuzabonut.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wumope.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/95201098347.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080278122b83---zifunukedu.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/fewovufamugadu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb1d9071a---tosorodapuzulowewidukoro.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddabe014a---ketikamozuxakubub.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/wewolizutifafepobenod.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609502bedf8a3---11585895290.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210810014822.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/19252697088.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/30500299484.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/10505452344.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/45887336509.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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 10840 bytes
SHA-256: 9d0cf8482c8f617894eff9e36c9b17df2653e7e1b93f9f3fdabcbe65db7b0f84
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16672 bytes
SHA-256: 3becd8646999dcda6b53a7e1c4290b16dc34fe0f0b271fe63d4fe21c3316445f
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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