Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74d57ea6b5b1e5c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-04 14:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e91406eb834cfbf29c8154f456ce5f4 SHA-1: 4c13fb74dc40c747ed5818b2faf449b1b0b3218c SHA-256: b74d57ea6b5b1e5ce45273c6fc63008f8f0698df8c5174f744155c874d3c9896
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised CMS upload directories or disposable hosting. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://brette-animation.com/userfiles/file/wisubenovuwavamexunojuzut.pdf
    • https://securityguardsupply.org/php/uploads/file/86940553589.pdf
    • https://birudongker.com/contents//files/mofugibawinavofigazor.pdf
    • http://hondaotohaiphong.vn/upload/files/turekutu.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b47c7f3a08b85c15b746a9df32ba4a24/munixuwonefit.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/76efd797c9c0ae7a384d04b68c5a0c20/85095856637.pdf
    • https://miguktour.com/FileData/ckfinder/files/20210618_4390D2D16434CA2E.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e91b62ae1---98228125381.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/66a4d0dffc7a16f1b6a0647e09822052/zaxuwakagalapumivewiwe.pdf
    • https://satybharat.com/ci/userfiles/files/62901283858.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/hke18o48p67k142s1kjcd0h7ie/64511990173.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/34vpfsqm6lj0cpslncr2iu2j90/30894018574.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609342a46f0c0---91792926461.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/71be493acfed74e3ec4ac2354b92bfd0/73707269269.pdf
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/jarixiwadidumude.pdf
    • http://lamachine.nl/userfiles/file/56123820837.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adee4ec2ac3---rudemutowodet.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35775419485.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c99a9bbc---59638400319.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b258804b---zegokuvom.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/34261584678.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e595f9d88c---44760941847.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa00f41e15---xizilewezoxolavazomoti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=manga+living+in+this+world+with+cut+%26+paste
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc17.bin
0294925efc1a18e12b5f62b1178e2def911578da3aa45ff96e7f0e0bb6ae8559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 18468 bytes
font_01_sfnt_off00010d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 16792 bytes
font_02_sfnt_off0001251c.bin
79b80b4ae34324675d12b651750ce4b30816876361ebf21112b88acb02c5040a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 4508 bytes
font_03_sfnt_off00013636.bin
baa26c53a990429b2b31b92da15ded747ba9c210c1b976c08977d94858ea0a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 10764 bytes

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