Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2812bd10bf425e6…

MALICIOUS

PDF

90.5 KB Created: 2021-07-22 03:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14d44cdb3e4a098ec86b1ca748deebf3 SHA-1: 53af569f17ce9e9f0cf3cfd4c4fa61875f8446ea SHA-256: a2812bd10bf425e6ae886a61667e525d191c4f23ffab374b68826c5534e188ac
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 as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dalnoboy.net/data/filestorage/upload/files/gowarubagoxuwepugokafe.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872ae9ea73d---23174987210.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070265bcc542---ridotutipakifobifi.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/gifalifeku.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f572fb3a---gotuvizafagosukavabuduku.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e5943bc79ed---69678910500.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43774f217988c531b23c1f470d1b8ff2/3878371433.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c756a856f---porekibizadosatonozati.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9737bac2---61720681974.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/1e2336952c01f694ee68e80146db3ba5/35060487119.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ks0ne8i60frcfk75afum9udbub/fapuduvumaxagafilor.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/21205629019.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa138610247---vuxogarasefitenewaga.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c468c7086f21c5c02929e577aca5ee1c/nimozux.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/71012414681.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a9374dd---26526089878.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f826628f5ed2c75a278b05c62561f655/20316177327.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/94562343236.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d1407a9a7---54062052931.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ac12e271---81546530946.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • http://fitviewer.biz/files/file/53599454145.pdfIn PDF document text
    • http://centrons.com/uploaded/file/212446693360e5db03ac4f1.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17c46c52a7---82328625885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+essays+of+all+timePDF 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_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 16976 bytes
SHA-256: 4a23e6ec46381fe68aae3320cc7a3bade1a4abd97ca4bd47721e7cf7e79c6356
font_01_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 10336 bytes
SHA-256: ef3ea30b7f4f68f5c2cc785aff30353722d320a2fb4b475f787d5e642460c9a5
font_02_sfnt_off00014484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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