Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61287a922e383b2…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 15:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea0574e09fc658ace87ddb9d252888df SHA-1: 334ab90a4d2f2a08e4e2824e6fadb8f0cda2c3a5 SHA-256: f61287a922e383b27dcc5d2aa2740286716639d049d2cae871fbaf9ee1e1293b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage download or redirection scheme. The presence of numerous distinct hosts and links per host points towards an effort to distribute malicious content broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd14e13bcd---korureke.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f7775b458---gaxupefanelosedakibirom.pdf
    • http://agataklimowska.pl/userfiles/file/worofupejolobegejin.pdf
    • https://bleikss.com/userfiles/file/gumorurute.pdf
    • http://zulassung4you.de/bilder/file/titasofudevozup.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/28568640574.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/6796694ffb8654fcaea356e338c82bba/35493340795.pdf
    • http://drthchowdary.net/userfiles/file/wepena.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc76d02a5e---lesuneluwa.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799b9c3f36f---fovepixejoxutimonifali.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e852e4ca---somewibowezemuki.pdf
    • http://joewhitefamilysite.com/clients/59967/File/45669677686.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607649eebf181---migulukowunapoj.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/102157065395.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d143e22748---5043210408.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd3c73279---7094678765.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cb2bf7cc---66533714329.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c20b98958e4---31935681317.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091894f82cd4---72147674801.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e487b572f---xuweranuzofutefupusa.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094784fef1e6---vifoxaru.pdf
    • http://armanetti.com/images/jujeli.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160786aae7a470---39544365243.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d3342beb628ece1d373bc1d412dafdeb/24144397828.pdf
    • https://a2designbg.com/userfiles/file/xafepiwavedozabekepas.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f41cb4173---54015757701.pdf
    • http://travelshops.pl/userfiles/file/tirunew.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fef619be210c56d5aaf50e1221e5c1d8/72683327665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=riddles+and+answers+for+adults+hard
    • 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_off0000fa20.bin
c5b4f0853d45f7f929e742913b4756310d32b90380fc6e17f62952d9a1ff3f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 17080 bytes
font_01_sfnt_off00012671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 16792 bytes
font_02_sfnt_off00013e88.bin
a0f04e89b2410baf20ad12ab4e6d03221e255400009975aa74b0d21a8e1ca17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 10680 bytes

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