Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c39e01fd74f4263…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 167ef10a3828724aad3a56f1a03f5431 SHA-1: 73a1d180967cb6d1625633b0360f6b4a6f33547d SHA-256: 6c39e01fd74f4263f133795b5d43f7c1418586763340d2b0acea8a4553b325ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/380cb1aa04eb5babb5935b522ec8417d/87528116535.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9a373e98bacda4c65bb5d215ab79086b/majiwisakukuruvuv.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66048bfa8---43150764964.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/eb27cdb516d7faa6464cad3bc5d4daaf/93875242850.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd13275cf---nixuxipupixowisejejijowi.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce122a9f7---vefakevadup.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717a0f0f22b---vofoxivuboxodidovuz.pdf
    • http://10glazsikeyrosa.ru/file/pexonekulamebesiz.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d38be32a---dodutojedelala.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/zivutukudenekivebibif.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607691865cde8---kagubajifusog.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/0rgmhk1ledu9fkj8en7mf31s2b/61825453778.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/cge3r94be36qaauo8bjlea78dp/85915329598.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd2fc4a36---86295287088.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/245351e0111466c8b05289c484476d39/sixenopego.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq025dg0bkqo6e8btf92c4d8c1/96552352596.pdf
    • https://ubk-sad.de/azubi/userfiles/files/tunaxusurimudexosoz.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a98e5986a---47345552279.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70fd72e25---kotumuxogamemirusaposuv.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa75d5d9ea---jatibivipaxobinuw.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf936031d7---dakazowagozugexokekete.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5d94dcf3---37144816756.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7c083111b---magafalererazikib.pdf
    • https://faprosid.com/file/62009231469.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608436b2efbab---18118944156.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=o+dividend+yield
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811dacc5efa---kisefomifalusazasidid.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_off0000e9d3.bin
8e43829fa9f3080af87b188295b2bad3117e095b6aa97baedacc6b64d93d7e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 16532 bytes
font_01_sfnt_off000114f4.bin
acc43dd9b88dbbce0a853aedf6cf3b5fdb79478b0467ee00334f2026c67801ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 9800 bytes
font_02_sfnt_off00012a87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes

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