Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf36b827157d50f7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 02:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62197a1460bfb4afd19f348a1e3fc55f SHA-1: 4ec7d0951374d217ea34e722d3037b6c48718e41 SHA-256: cf36b827157d50f752790bae4f741df3cfbe7cdb0d679c04b663701aa78a72ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.icareonline.net.au/ckfinder/icare/files/98900495786.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3df81765---40538246130.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e9da42af3b31ca6c7cddbe01e400e570/90422305046.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49235339105.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fifa7opm69k9u1s2bmjf67ih3/pokigibibamex.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/daxixilejiv.pdfIn PDF document text
    • https://seger.cz/userfiles/file/98050950100.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7192c62d3---xodojuv.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/pupanus.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/70651450971.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/20431013385.pdfIn PDF document text
    • http://blccy.com/userfiles/files/lidolivebomuserarijufozox.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10597449257.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130c43a9f97c---80023716340.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wedaloxewexedujupekimu.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/54798869768.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/20707829463.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210911045324745048.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rq0c1k0qf6m3rv4ttrv86e6nci/tazupurejuvuvitaleleluw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4ead97fe---falulotowezufavowofineso.pdfIn PDF document text
    • http://kammed.com/userfiles/file/jejovolomibifepukadeta.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/11397126251.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/31069564261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=items+that+start+with+letter+vPDF 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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 10252 bytes
SHA-256: fc31b4d3e3c6ddc78adb21257eb11f73eba0c2f703ba89c645967c9bea012a3d
font_01_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16372 bytes
SHA-256: 2af6cca5afc8a72eecb18f76de90ecc172793fd827158013a3701d34c0e04cf4
font_02_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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