Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b2c268b161eb91…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d48626aa996a8f82f246e4d8d6a12b3b SHA-1: 5f681d5f9b8e7de58ea58a0bed47e57dbd2ac6f3 SHA-256: 33b2c268b161eb913ab525adc76495942217dd0c5982b4c36eef5d8a4f8a2957
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting it is used to redirect users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drukarnia-warszawa.pl/pliki/file/80470521733.pdf In PDF document text
    • http://dagmar-e.de/userfiles/file/bezin.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0b549105c000f8bf9f7d326ee8e22fe2/nisirisumijukenuwawi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075708d14610---nelokup.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1e9bnlf6jnf8h9smeb6ptat7r0/33199441368.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/36955475636.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/xegetenaturugosonilap.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/90665346511.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b8ef6ffd0d6d3879b52965985687d17c/16881879789.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098313e6e8d5---vedenoxebumetaxuzejajude.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/66559937677.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/27395a207b5e3bf8459e9ff538cb2292/josibobimepizawuboxoj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9c3ad4269de4a87c4ddfdbcfade72a23/zubiwazejolinebi.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/96494353660.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0afaab947979aa81a2abdd578ca9df9f/xanulesavexokodavija.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1ef738e56c8925fcc2f58bb25e34f65/kekamejagotegorid.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/81933934838.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pibazomuvo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c977f5465d7c96b8aa9b815d15ea33d9/bitodejuwulaw.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/60254619164.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/durikatarewigija.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wanupuloba.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jifolojokuwizanulefulupob.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/96785408481.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/goguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=skripsi+akuntansi+ugm+pdfPDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 10812 bytes
SHA-256: cde55a02501ab8c38130d49d5435ce612a480732a454269cf055f6e3019ec319
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 18100 bytes
SHA-256: 8014dc68a58e47ec8460d28d7779d5682bd5dacf06732a16d883707dc5436afb

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