Malicious PDF — malware analysis report

Static analysis result for SHA-256 1600011c42a9864b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 03:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb3d722b096f9623c53fd2caca03df36 SHA-1: b6800ca8cbc8a03e35507c8229485d1bd8b921d9 SHA-256: 1600011c42a9864b77bf1eea206bdf82268dfb8bf09abbf875337e99ef0df283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://allytemp.ru/uplcv?utm_term=kendriya+vidyalaya+recruitment+2018+pdf PDF link annotation
    • https://limblength-sldf.com/userfiles/file/jasenonidakolebed.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c92b7d14b38165bf90a36cdb41747b96/rajinagijabularivaxa.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b259a3b8a6d---futor.pdfIn PDF document text
    • http://leguido.net/files/bulesopilodozazisep.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/nq3qu8nhf50argbtdnet2518c4/11681094293.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/15737290633.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25929463780.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/d6avm6b0ns00c8p9p7bp6bdo40/donurasotomidiloro.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/tegejujamabuparumuteta.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lunoxavipesusimoduki.pdfIn PDF document text
    • http://aurora-c.jp/files/files/xufenafelodo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a329ad57---zoxuw.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c430c92ae3---vomemuvu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2d5a1c4f---67225356354.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bb489b084d4300fbdd500cf170023001/79328054737.pdfIn PDF document text
    • http://rld-carbon.ru/file/zozupiguwejiwoguxow.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9e53dd4cc---37678376829.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/2009958011.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/forunugetowuwi.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/tegugomif.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa83d32542---6724366328.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/xoziwexuzisilonuwipuzujaf.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jejuwola.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zepiloviwej.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7daa549c39ce949115440483e1833ef0/31655762152.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mejinulun.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/710aedb88a3f74bb7060cc4bd68cd800/25386794967.pdfIn PDF document text
    • 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_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 17436 bytes
SHA-256: adc233fa490ebd68b00cdbb6e2bd1c593d54efa0bf2e91da12c643540d9643c5
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 11268 bytes
SHA-256: e28a3c98787ced004e14ba4da4c99fdd6276a60546d160986c7eb4d11c10423c

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