Malicious PDF — malware analysis report

Static analysis result for SHA-256 f855ff60496a2ce4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 04:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4c8d767578be6f4195e0cbf55072fb9 SHA-1: a951cf6b6cd63ac5d4ebbc8e591884eea5d7bdc8 SHA-256: f855ff60496a2ce4c556daa803a398e390c0df7a907dda4a83a956e001d3f8f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm, with several URLs pointing to compromised WordPress sites used for file hosting. The presence of these links suggests the document is designed to lure users to potentially malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f5a0416e---wizizopigofuwul.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/tofadi.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/31429094827.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/disonabufamonibukeguvivob.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/kenofajuzewuvo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/82703813987.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/kulepo.pdfIn PDF document text
    • http://eksternest.be/images/file/lomelaxirafereko.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/famamibemabotul.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/voxitejerixotokepalivaw.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310387bf96b---denagunivuvolofakunazum.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vudinus.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90939344115.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demenixavuvizure.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/xakakulapolidevuki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gunixo.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/57088381159.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xewazedikulinururigufon.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/93906700894.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/46382293489.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jekodi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/78137639241.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/76vl280463q8puk6kj5n78dac2/puvazajawomirovadopep.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tazezumuzatopusi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0bd35a10---63183663804.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dazunewuterenemimokobijiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+wtfock+season+2+english+subtitlesPDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 11048 bytes
SHA-256: 1906ce2462f84eedd2d02e9424641957e535d87ffe401570e5429a09f2b8614e
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 17408 bytes
SHA-256: 8f92048d8da963b50a0777886e2d160e635a7c86f4ba347e8795609fd165241f
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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