Malicious PDF — malware analysis report

Static analysis result for SHA-256 607b39e8e3650f09…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 19:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: badb915fc7f7f7830d775a42895d26be SHA-1: 479381da699675eef8b94255ee2c675c6dd5a3a2 SHA-256: 607b39e8e3650f090eee97337be5029f862d7834cdc94d4d56fcba7804b19e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 websites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://irlanc.ru/uplcv?utm_term=subhash+chandra+bose+history+in+tamil+pdf+download
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd529867d68---7799474102.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/53216848077.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/451a0bfa45f8e4125d7b561969e33aa1/dexobakupepo.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f916230a---4524892923.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d637feaf41c---66230627303.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952e7e116bb---remuw.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ae6642cc---megoka.pdf
    • http://gospelinamerica.com/clients/874377/File/lisemizixowemititipuko.pdf
    • http://phongkhamthienhoa.org/images/files/pipuzudepejefufowukukuxi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e88c664cbb02817dcf9c1fff5d5aafb1/tuwixeronowirabaxozakojom.pdf
    • http://thunderstar.cn/userfiles/file/20210612001428409281198.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607268c8342df---kuvewemizavipusumigizug.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ftsn615331sd5h0a6efpimfjpo/menevegewax.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a1267c938---medipigigifasavare.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701942a3f2b---79450952523.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/42cb4ee697b40b3ff2b2c7e90774d599/44249540274.pdf
    • http://danfilenemd.com/clients/67744/File/fokad.pdf
    • https://alshaabcoop.com/userfiles/file/jifazeza.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/88jl768p2fbmlo785hblie57up/68319287062.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705172ba175---49682601971.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff83c77ed---73410168867.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f2017df0d4c75d6f73974d20e59dbd83/76421528101.pdf
    • https://mediaget.com/userfiles/files/48459672606.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a1.bin
478bf451c434562409b9b8b7c3704bcf6d8b69db20d05186b0bb5db664d69421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16912 bytes
font_01_sfnt_off00012045.bin
d458fcd0b68f5734f3afac24e940fe0d3460ba2609e7499795e0edf635923849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 11400 bytes
font_02_sfnt_off00013ad3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 16792 bytes
font_03_sfnt_off000152e4.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 16448 bytes

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