Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7592a65f4ab518…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 20:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c3cf6e47063fd6117333234d7843ceb SHA-1: 9eaf738a447d283fc316301aa17ecc337f7fde67 SHA-256: 3c7592a65f4ab518d7993281f179c0dde057fb8b4c001a5c0a8f1540b9a7ceea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories, which are likely hosting further malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations by redirecting users to these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8f4e3cd7038be638b4ebc2cdd717fb8e/22242421571.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb27a1a3384---pekujodubuzuzunavula.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4abd8e76d---jizuloginamawedumoj.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0361e9e71d---46618175287.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/67514731349.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhb3fmcekcah770kkeatphb3qk/26009098585.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dp82dj5i0nh61brnl3u958q7vv/42463993838.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wujisepisafegediwifav.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cd9a65d9b244fcd49fd7fcb1f77caa86/90019842946.pdf
    • http://divorcefinance.nl/uploads//file/45242284569.pdf
    • http://sujitonweb.com/userfiles/files/jijoxunawirefuj.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440ccc1a7f---bawejofameruxapa.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddd99d9d3---47074883026.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14449d12---tiwasurokuzulibejujiti.pdf
    • https://dalton-english.com/userfiles/file/dorano.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160962a9f336fb---ravefatezupav.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rdadg3tljvpf7evj6ag19oes3c/78057172525.pdf
    • https://contactfm.be/userfiles/files/9054187524.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7kmdr8k40staacku1r9jv6ljo8/4993624863.pdf
    • http://dongshengcable.com/images/upload/File/nexuputugovazexanomejowil.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f838c93090f3b361514e7b58da16417/48573733562.pdf
    • http://sushiosushi.com/uploads/files/mifezuwaforipoxatilaw.pdf
    • https://motelandratecuci.ro/userfiles/file/pafuziv.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d763ba5ec---sisiboza.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/a47c8055ca10eb82c4864c842c8b3c15/gokaxilexikilabezesugiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stable+pretest+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f102.bin
1ffce2c9720dd2b93642aa546fd09e85c9138782ff6af526f4848d67a4206a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 17500 bytes
font_01_sfnt_off00011ed0.bin
4f36631111e527a9576304290bb631fa7469aa074080dc8aa66b8681ac2c944e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 10332 bytes
font_02_sfnt_off0001361f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 16792 bytes

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