Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f60c6c533e8d99…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 09:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c6972c93590bb34e6dc399c7cb14013 SHA-1: 871253f7b8d87520d99d8ff4ec7355d7caffebeb SHA-256: c6f60c6c533e8d99cc15538e3e0d7cdd26466393c3328be0e0805ecdace342b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rocincorporated.com/domain.com/images/dynamic_pages/file/miximafabevigebopomile.pdf In PDF document text
    • http://retroldn.com/userfiles/file/4302685098.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a5d3a1c5a971b6228250751ca64d0013/35300572313.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/36078258536.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/t4rp1e12q135g6onm4o4gh5j84/99449785723.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/tuxezimuxusejazeroneg.pdfIn PDF document text
    • http://93564497.com/userfiles/97746718498.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/44155284119.pdfIn PDF document text
    • http://chikatere.com/Upload/files/22858958510.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kopojalan.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/31799615587.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3517ed257---peposilunorov.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108300700001415.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xosab.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb908d9e34---fozixopulolojiboja.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160860dfc725dc---32193524111.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/panibajakevusuza.pdfIn PDF document text
    • http://ihdbd.org/upload/files/11238485088.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f56e7e45---80811891631.pdfIn PDF document text
    • http://starsunited.at/upload/files/zimurutinadaxolegaxoza.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/tisikeginubomipene.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/95d4969d95ff6f165b5e9a60974838cf/fememinuratagefabamez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=micom+p127+schneider+electric+manualPDF 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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 11092 bytes
SHA-256: 9718ac3d2357a30a992ae5d4e68542ecefaddfb725f44f7f29dfc564e990ad1b
font_01_sfnt_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16780 bytes
SHA-256: 0fd74fb01553796eae3aa42794a4ac6e64ae0f59d08e7cccda7933c3fa606fcd

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