Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af586516282f385…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 16:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e62f925b2da02d532839dd464534bc2 SHA-1: 9b5cac0c3d886aa831bff5945b88be8494146eae SHA-256: 1af586516282f3851d9d79a44b0fbab0a49915f6da01e3f002a520139b0d6585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of multiple external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://archism.ru/uplcv?utm_term=do+i+wash+white+clothes+in+hot+water
    • http://10glazsikeyrosa.ru/file/91328921166.pdf
    • http://karthikeyanjayaram.com/userfiles/file/1292054201.pdf
    • http://www.niziointerior.pl/upload/file/10492704335.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/de18617f5229754f34af4b47560499d4/1387918762.pdf
    • https://anfauglir.com/images/file/pudasesenabujoniruvefi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f5d23c26---nexamosewunipulutexipoza.pdf
    • https://tocken.se/anvandarbilder/258/files/rejutonife.pdf
    • http://fszhenjia.com/upfolder/e/files/20210603201848.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609201db4bffa---96065502335.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083504fb857e---retosuxum.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5a059017---77335765183.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160706d8941953---wudalafajolemama.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62db00b3---zolaturigubugaxalujuz.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b27ade48768---sububiwekasafatemedutu.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1165bdfce7cf3b2b227b90455220b91c/desejo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2vqma3nne63tm2acuull3hhma2/90128359333.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e346.bin
c6d41edf3f803936a9f9a70792399d681784dd2fb5dbcff71d3cb09c3a0e3a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10412 bytes
font_01_sfnt_off0000fadb.bin
98511b8ef65fdcb17f26aee22774d063d470b9aa3aa69eae204c5f220ab30176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 16476 bytes
font_02_sfnt_off0001257b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 16792 bytes

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