Malicious PDF — malware analysis report

Static analysis result for SHA-256 73606edcc5b9fe40…

MALICIOUS

PDF

92.1 KB Created: 2021-08-10 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41d725090a277ffb3bf706d116237751 SHA-1: f7f4d3df68f3919e2694a75341282d3b893e5281 SHA-256: 73606edcc5b9fe4008f86c9db1f89636514bf21e37954aeefedad5b97edc07bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://chcial.ru/uplcv?utm_term=research+methods+in+the+social+sciences+8th+edition+pdf+free PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e1rmffoigjguh2ql9939kplb28/28054312794.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085823723bbf---ratulifubitekuguxeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbaa5a521---12083000599.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd01c8f5f---74099381185.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///golenanabulapanomosivuwo.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/zizolunekokoxujisu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/92676752958.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4ff946b03c277242fb009be19d5a96e0/zutarigakosep.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f28185834---bevodixaxobog.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/fizinexeluvebovugipi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/serawefoderudekawij.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/nidesiwasovilileviv.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fad8c3f14---48114459057.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc39a7b92e4---3837139504.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/renegakoraw.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/fuwozemoroxowunovefa.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/nopeguwejipexapelegono.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077585d377a0---47273421820.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3b7aefc3---63842674935.pdfIn PDF document text
    • http://suitianhose.com//uploadfile/files/82263962295.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100434ad6df7---54750943025.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/ruziwemulemo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a7567dd0---repepo.pdfIn PDF document text
    • 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_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16900 bytes
SHA-256: 3d04b27d8cbf83631d277fcdeac4e7683f88e639ccbc4c217bac68fa766b2d93
font_01_sfnt_off00012f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 11136 bytes
SHA-256: 7eb28defbf3a77611c49e93798cfe4699a9930f582daa3a5d9615c35e1ef68b2
font_02_sfnt_off000148f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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