Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf6211bd6411244…

MALICIOUS

PDF

115.3 KB Created: 2021-07-26 21:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5004d8e949e543c990707434e4a8824f SHA-1: 8e636cb1e8ae158b8ae5ac3537d708ee619ddfa2 SHA-256: 2bf6211bd64112441f840ad1745209cd2a1047fe6c378b8eecf8ccb97eaa3ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/76049033773.pdf In PDF document text
    • https://abe-rdc.com/userfiles/file/nifufofajefutimofo.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/givewalopa.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/29429357448.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a022f579bc---nipumu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3659a7e95063db4ccc69e9dfcfc331b4/13867132874.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ubmn346pshcis973gs3cu7n431/dewuxuburalewo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/kiriwufefomovuritinusota.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/98831800102.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073a975ab947---gesegopizidin.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/27380580066.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb3c3e512---rexixiviwix.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/75758582149.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d21f5e279edd090eb10725a247cf020c/lupudaloxada.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/dotopinof.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeee79e7e6---60813062639.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94338181147.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2da0c9d0e5d62305c8e7e6fdb586e395/80729324642.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/nasidibowodapow.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/222e8dda97b3868665c4c938a717f8ff/10628546841.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/pawuvi.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/210a3a3044aac285a9f4a46263ca84d5/69010006841.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/533ad08266ef5159da7fba8362882101/92046947562.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9ebb824f---3933733899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=surah+yaseen+tafsir+banglaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001857b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1857B 31464 bytes
SHA-256: 8b2dd95b829c0987d7c77787a81e308de63e18ec4d5f1e152b210a754bc3bb6e
font_00_sfnt_off00013156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 10800 bytes
SHA-256: 1e9da98967b48efb7f1f09c02231cb5e56545f3eb364ea04ac5c4e312c1f6a2b
font_02_sfnt_off00016241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16241 14392 bytes
SHA-256: c69ab5de97f703f00eff5ee41e9ff356846243b82cef786c07bc18119ce868c3

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