Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec3067c080915ee…

MALICIOUS

PDF

76.8 KB Created: 2021-08-14 07:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d5f59ffd9403491b85132cb645961e SHA-1: 6cf7e74f72189baa52be9f76036f2e8469bf6294 SHA-256: 5ec3067c080915ee611f33f27176ccca5bdd7c4aa5f3f8a81da1e16c67a4bfde
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content. The presence of multiple distinct hosts and the use of disposable hosting further support a malicious phishing or distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6312697ab0---vufirexo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd73906b137---28279220921.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/narulew.pdf
    • http://huthamcauquanggiap.com/upload/files/67581949748.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1503ca169c1f89a32ab4e7750bf6d383/xowenafinikovigomupeneluz.pdf
    • https://kaktutzhit.by/uploads/files/jenijobitatosi.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadecd6157---12158202701.pdf
    • http://ekolojikweb.net/upld/userfiles/file/30188422529.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9932501c3f55118a17eef8e9e369da06/ripodelemi.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/badewumilal.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4tgbtjoobtj4pl443fqk5lo8cu/87656231787.pdf
    • https://almuhja.net/ckfinder/userfiles/files/pizisimibavatete.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/207b0f4d42df96d43353433674f1b242/dovefesa.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a75e653d9d0---funexikijetuxarive.pdf
    • https://santehsevast.ru/userfiles/files/15992671923.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210708_7DBA96E1941ACFB4.pdf
    • http://yaqeen-eg.com/userfiles/file/65842006112.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161167a95e7803---jozizofitifaxakezogo.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ff6642181c522d7d65497ab643cdea52/zeravokezukimipajiner.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/24564676112.pdf
    • http://asiavent.com/UserFiles/file///73571824562.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+free+youtube+to+mp3+music+converter
    • 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_off0000c9d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 16792 bytes
font_01_sfnt_off0000e1ee.bin
9d05cbe92580ff60f6c72017c1bab93ec4e466a3aa81225ab3ed5e9157db3cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 11076 bytes
font_02_sfnt_off0000fbb1.bin
981fc8d3109a7390c01f5a26e5902a091eaa5867bf8007e6040e148d67c05554
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 16052 bytes