Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f6070d263a88ca…

MALICIOUS

PDF

89.5 KB Created: 2021-08-11 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f41eaab2096baefe9e3107ea9097fdbf SHA-1: b0b82a21090ad0900324283c34c21ebbd700b86e SHA-256: 93f6070d263a88ca174bcbe64d4ddc25cdfd03e5609706b6e0f0cd279b6ffa6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://serramentisiciliano.it/userfiles/files/dodudujosunulasosefi.pdf In PDF document text
    • https://oklogistic.lv/upload/file/33531062792.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/35016563897.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/lonafikive.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003851023b5---zamevabexenojinobedurab.pdfIn PDF document text
    • http://seeandhearbetter.ie/img/shop//contents/35879484386.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096284ed9b08---14115905245.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/43572652565.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9c48c2c1f81bc60a142d8ae6cde45d72/44720880504.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ab34d1e0---4698345111.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/76498032789.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cf04c3b82c589d7d70d1af250a905755/pamebeto.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/refepopa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7e4649fcf9651576ff11294c5a8b4723/37820404150.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/metipasizotajudadaw.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/desotopewiw.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/lerabovizisabasidid.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b876ba91878---vowewububoragila.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0b315f53d0ee528cb9eeb9549bc532f8/5604082084.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609842503de42---44839494594.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c746e4ca680---felevewowidusiweme.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608320874e0d9---doliroromo.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/musanuxeremapakikunidu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/19573614581.pdfIn PDF document text
    • http://www.moyekolodin.com/files/pifupinabuzezovudagaxuvuz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6a5a2aa5---88222587155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+eliminar+manchas+de+tinta+en+plasticoPDF 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_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 18044 bytes
SHA-256: 5fb9a9c3c1ecb9fc78a3d04ece9da4853842efc21e8c643bcb9669faf2b03e75
font_02_sfnt_off00013c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8E 10808 bytes
SHA-256: ceca2755983540632b061c47b284b2ba23a0ab7c6a5607dcd1094fb80d7c8895

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