Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43a8ee532346c00…

MALICIOUS

PDF

98.9 KB Created: 2021-06-26 01:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ada34c2a4c2b57237d613b2b1a5a414 SHA-1: 0f5c76988f2f246c9fa5e403c22a84bb82977343 SHA-256: c43a8ee532346c00f672f45f37c2992b1fcd13009ed137e5c28a4f4d12f83a54
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 file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://garglob.ru/uplcv?utm_term=how+to+slice+a+tri+tip+roast
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3m54f58is7t4plql7mkbr62bg4/befepidomipefazijox.pdf
    • https://booknowrentalimo.ch/userfiles/files/vavitipaduxadumiwupo.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dadbcd896---95172401360.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68936a779b982231736ae6e5fbc85d6b/luneladu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba932aeefc4---96688675833.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t84tu3epf7rte1pfv9toj5elo2/xoregivorisokewufem.pdf
    • http://guides2alpes.fr/uploads/file/21966904501.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758645a1fc5---bowozosetinasixavijebe.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c870452267---jaxejarupogefosivof.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/susenoviledanuliriluzoke.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f34863fa771e6e7c9810fdbb43c8e93a/tibividulesizof.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c379910bf0e---31854170534.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b075621f9c---13976616571.pdf
    • http://harasim.cz/uploaded/files/jamipivuf.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/17c0rach2bcp6udm4vubdu4n20/ratadabaluku.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160be754c0ac95---silokajurame.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4637faea6d---bozutipo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/881835d4ecd598f74cc3874dea15fd57/95937876944.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/45f1071aaf591abf149002763e6d4f4b/juvineturof.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/23084264ffa29471cecbb6c6416e5170/tomemofopipumaxisu.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/45esnmg1oavqv5mu61hpqc2696/rifesuratuzupegakudilevax.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2u7pfd329a654jc70415315omq/88612449289.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9atcar6ep29d5mvls981g528c/tupoporivivuvaza.pdf
    • https://kingcarmotorista.net/uploads/files/turexola.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/37104152163.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_off00011d68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
font_01_sfnt_off0001357f.bin
57ccd3b16ae7e7b5d9bc79e18271286487d4637c71ac00cb8500b016003eef06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 10340 bytes
font_02_sfnt_off00014d00.bin
fa2ac1969688f418da56d4e2c9e413cb4cbb6306b537c335da0ed9fc7fc23f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 18768 bytes

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