Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44968bc8ac3baba…

MALICIOUS

PDF

101.3 KB Created: 2021-09-06 00:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32a2cf6897d728bf45b4f87a686e5594 SHA-1: dbdceb103ac8fc0785cdad51434fdb437cbc0b97 SHA-256: a44968bc8ac3baba2f51b6fb8d51714bbf5643457639fc064c176dd619bfc233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm and compromised hosting URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://heatherjansch.com/ckfinder/userfiles/files/sixovekoxewojapabijuxebuj.pdf In PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/mutoxavedutajigodore.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/vomekedafox.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/78d01de9c542891069d03b56ef00195c/gelozozivapuxa.pdfIn PDF document text
    • http://palami.by/images/file/sabinuneb.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/woneweminotexetuwawezoda.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ea61f7f0667f69a10e5f0216057a8e97/rapisetegosunixewelajajot.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210616_091432_6018.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mijox.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/giwutofatedofusu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61b06fdbf---53390326162.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/zudokafodedapapibefi.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rujagokasufenodibobajozu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608186b074d20---wanijiv.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0aa16c8b0c5efdc8f4089697fe8ac1d3/97628139182.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6a7eb2f0---3322597429.pdfIn PDF document text
    • https://uangraja.com/contents//files/xamokofotes.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/46349581949.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cfa86d04a66c901497ded1d9e7638309/37376805903.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/wujipesatobajatowale.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/74727455861.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0444f8b4---keluvosijabupokivavejono.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/lobazatasufumuwameke.pdfIn PDF document text
    • https://tavio.ru/files/file/betebodiwojonit.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613421ba5093f---sikilitukedepijebegizanir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=recurrent+tonsillitis+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 19756 bytes
SHA-256: ad7188e558dca85fc48adafb7d0dfe515591574be54ef0b9908b338282ef1724
font_01_sfnt_off000156ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F03 10596 bytes
SHA-256: 3b776695f245b9eeb79a26782b60684365b8adae37dde960fa49afcae1ff10ea

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