Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ddc9c5d0b9a1b0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 00:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f225a4c1a9e067d8c6399a839f6716d SHA-1: 5f03bc1ad01db4580bc37fa080b02aa24c3a743e SHA-256: e3ddc9c5d0b9a1b07c5b53f88e9a42b6ab01eae31f0abdd6a2328d4ebe1ff8cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16093b09dec413---leguranalexukesetomawu.pdf In PDF document text
    • http://educasters.co/ckfinder/userfiles/files/17454604317.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00cc3192ce---50555568530.pdfIn PDF document text
    • https://carlojans.com/cms/file/59666501341.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/fegoluxuvanegekatefi.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/zizokotafitijila.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6b69e217---94236534586.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/cf25a2301cc5dd331b986dc44f514f67/82928120456.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ab2cf120---gobavududabibezo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71361beb2b---kixunelozaxefasuguvumamov.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0d626d389ec111869e2da19184d3ae0b/gakolitezaremefekit.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/lirufamuperominaru.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/51364773294.pdfIn PDF document text
    • https://aedwea.com/upload/foto/43618946777.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/54678337303.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/58034943449.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/1745613460.pdfIn PDF document text
    • http://veivel.com/userfiles/file/95964384077.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6146c5921---pisemi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073784243a2b---vezonobopexufitatimate.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/36996737890.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0uencb9fdq6qa8b4lr54kkotc3/59016055180.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/15876647937.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a061d1e7---76912187067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dictionnaire+des+difficult%C3%A9s+de+la+langue+fran%C3%A7aise+larousse+pdfPDF 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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 11248 bytes
SHA-256: c7614720025f56e666935e6722f34192ab140130fd51b9e53b51c966695c375b
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 22388 bytes
SHA-256: b908cc249024eecae54023ab53f7342f3f89be0260acd0adab29fd611372034e

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