Malicious PDF — malware analysis report

Static analysis result for SHA-256 36367fa41e7b988c…

MALICIOUS

PDF

94.3 KB Created: 2021-07-31 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d64f86eeb329b211b99ef76e4283630 SHA-1: 9691cff1e39aee2d7e12f577952e1d0167777bf7 SHA-256: 36367fa41e7b988c983679c0fe7a1e32a097d90bc206d9cd58a7ea0fe0f69f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure or a distribution point for further malicious content, leveraging a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://crysiq.ru/uplcv?utm_term=plantronics+voyager+legend+wireless+bluetooth+headset+instructions PDF link annotation
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/86669915654.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de03e0c8b8e---34241961362.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e37f2bcf5a338db5411d53fdecc4aea9/fijukunuboranirabo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/28244457606.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/fetopezinakexefekak.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/2514d6ad6fc56da842f28dd4e3a6be05/19892866188.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5e3fba8bb4f625afd655c5579a686b00/xukivetodowukobokatizu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/28963759811.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/36772609442.pdfIn PDF document text
    • http://kfbi.ru/content/file/wuvikobifojot.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/gurerarakapepinadu.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/46771213969.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce26b566dc---denex.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9bd5c711f7b294133480dbed6587625e/banugexidoge.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/16937527050.pdfIn PDF document text
    • http://primaneighbors.com/userimages/pupitivolizamimuse.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921f0bc3de---resetuximotekim.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a9f37709---vuvufose.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/92347942219.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/migajedafumu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c672ab49abb---pijej.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vusovakep.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075428f7f68c---31405646288.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086051934cf0---84824849883.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105100747436599.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160847e8e88bef---31344482444.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/tebedawavedogiragep.pdfIn PDF document text
    • 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_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 11156 bytes
SHA-256: 9e80a972c6e70092c4eff14d90fd3c35ba057e367a66d5aefeb60956a04487b0
font_01_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 17524 bytes
SHA-256: 150b95e91ecd20bf9c8323769aad0d02877e87b9925d386a065fb0d45f22e051
font_02_sfnt_off000151b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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