Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2d6f033d2cb4e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 10:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6b20662bb76421889da83606fcb1384 SHA-1: 0d8c14a9d3cc31f48974cbc90f4546c8ad17e2c5 SHA-256: f2b2d6f033d2cb4ecfd7ac19f7c59a307b3b86120de956a0869df6ebf605891c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://infrive.ru/uplcv?utm_term=machine+learning+mastery+pdf+download PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mpj34lrm3ra7uraeb9dtko28ja/vakekovejurever.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/90095627646.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/14828655544.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16111fce15df70---kilexexedokotipuxivosi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c9190040---detukarebarasapolazilab.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48jvvth19b3nmogj8r3p10jb1/59199538815.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/23090054259.pdfIn PDF document text
    • http://unseretochter.com/images/file/36332194072.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050908464566976.pdfIn PDF document text
    • https://ocw.tw/uploads/files/nopevikolimimino.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d041ffd3---19058394007.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/53519115780.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/92338511266.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/jatonujilo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/77874858401.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/65051234842.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61128325720.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/xolobokeju.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qos3j3o4h6610ahcakaq4rr0p5/jenasetuponepomot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f112fbf879---vijoronepigo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/rasalugu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/436d4edd6f681eaf995de2ec1b3a456a/maxetuwinigetoke.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbbddaff6---gizesebekof.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bb1f16f9---39687288745.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/jakusuvofobizu.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_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 11260 bytes
SHA-256: 40e1ec5a47f0313900036771019ae2d68ed252f7b97260fdc660df3f3ee1ae7f
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16796 bytes
SHA-256: 24c444c72769c5973af8c9a34387d03f9bf758e74492528e5e08716eb66a4173

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