Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be7c8354c1f34eb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 03:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8aa0df48fdbfd33ed6f355b5363eb6e SHA-1: 43b257a9a37459b8fa711ef461bf90ad45ec993e SHA-256: 1be7c8354c1f34eb9003242c3ca6dfbaaaf583ca758fb2e336739e837e82ad9f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many hosted on user-upload directories, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adgroup.co/userfiles/file/xetag.pdf In PDF document text
    • http://isvpro.com/custom/files/23515570086.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/98378764276.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/55924699830.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/47649965284.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/53537258501.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/47503625882.pdfIn PDF document text
    • https://hiroyoung.com/data/files/21157552698.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c209b4d1---55630763320.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/xiteseterapunubelazez.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/34347302928.pdfIn PDF document text
    • https://ms01bet.com/contents/files/wumoworifineniwogofa.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/muxaluwenipanujolubad.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/60186827777.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/netawegawomeliwisusuf.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e706f5df---disapo.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/povefuledate.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/43544878200.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/31557737337.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/160dfb6d5c1a3b0feba2e5cfad35532d/kebiwanubakojo.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/lorozo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/39121773668.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/puposupisewut.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-6/20210906195025822774.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/74352ab25b2401230fa76fba0b51376a/74479355504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spooks+season+8+episode+3PDF 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 15352 bytes
SHA-256: c7b4dec7787f2c3e790322ed5ef7a5fd57a83ed294daa6680b30a4e6d59861fb
font_02_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 10688 bytes
SHA-256: 692c01e3fac9b367a8c83166243f4805f69000ce506c171f4d2c03f94a7acd7a

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