Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26a1bfc572a060…

MALICIOUS

PDF

103.3 KB Created: 2021-06-27 09:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d5ccd64998b5d9e0eaa3b55c1a88dfc SHA-1: 6f149096b80792199a17a8d81e032a978fd0eb8e SHA-256: 7f26a1bfc572a060f865460e8375801804ceab2b0e32382dc82395a3c1e4ded4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/43574894225.pdf In PDF document text
    • http://baovevietnam-vnss.com/upload/file/68117776117.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/437f1e22d9fe9f223e16f5a58a0c7f15/23280797777.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa61ba12---fesafixatim.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dcfd02ffc3dc6df6ee6ac4f49b811726/kevujosawovozonolotew.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7c755b65---pitalabevilotamevupur.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210516215548.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ae004f16f65---3239453584.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/wuwir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a507fd7---bofejividapefuxa.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0ad002f5ffe888e9d541fd68a99ed204/pazif.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e903e24be---55127191068.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dipokijujovom.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/turapezejupajukivowawanok.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1482d53a07a7cd4000456156e0f1e202/17055576876.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ffda9de2---83166209733.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/bepaxasi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/98719323957.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/jidenuveduwar.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9ktsi42sm4q3hcv4u694ttba3f/bogalejunotenunut.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dbebaa9c2534c8234d4625af80f09ffa/detojufagomutumav.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/1473132234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+great+gatsby+location+mapPDF 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_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 17464 bytes
SHA-256: 0f7d02a429991397f677176a302890af4a25679f6d0e5b67aa51a7e00f4051cf
font_01_sfnt_off00015d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D49 11036 bytes
SHA-256: 88875395fd9e73e97a09a81c13e234d00554b11033dd59591b3fb53685e51de6
font_02_sfnt_off0001769c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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