Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351d8bd64d00d77…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 11:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7c21dda4eb5508042169aa005ca30a SHA-1: 64be3ae6b46e590f5164999f7311b93128f04b38 SHA-256: 3351d8bd64d00d7798ba590dd3ca00026568a69155f43cd13a3b44b343f87392
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=snoop+dogg+in+the+90s
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf31f362f---jufeguwi.pdf
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/18522317376.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721579e989f---biniresizebibevogivopi.pdf
    • https://mn-lawfirm.com/box/userfiles/file/76265225728.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4f707bb4---tamabopulif.pdf
    • http://cedule-plachty.cz/files/file/fogobufomakoxixejijonum.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af70f29293f---rufazijuzafem.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e265de609a205b8422a8e222cab240b1/75646511516.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/bf21e626a82ac716198c081d64d4df9e/76518626246.pdf
    • https://conexkarvan.com/cache/fck_files/file/35501887408.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68f396be---24758180115.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1561111525---65154169769.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c66c6451986f0725174bfacd603caa5c/23907403170.pdf
    • http://luingpyrex.cz/foto/Image/file/25435161558.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8d57857c---72269014378.pdf
    • http://usateatop.com/_upload/files/xejoselomefakerelijuvigo.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e36533a5156e33db8d00b297806c5d27/kiwovoxutenudasuraliwaz.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0962e98---kewime.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/19e46761f5c6680b383b18e56df4a364/rivikur.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffe9d421e---15516909615.pdf
    • https://schlosshotel-murten.ch/userfiles/files/38050816681.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae08190c9---lavafusozoresuvebesigugi.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917de176b2f---82060222816.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/34f99h5ns10o80egs3ppjj865b/rutefoxogojivu.pdf
    • 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_off0000ef68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 16792 bytes
font_01_sfnt_off0001077f.bin
70cc48b8ff9273c3371326d3e2a26c9fa289640d20c9a876202488659f61ce17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10728 bytes
font_02_sfnt_off00011fd4.bin
45da2f2ffb138ac25b4691db6be5247ffd27059efb1c3125dcb9f0dff54a03d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 18064 bytes

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