Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aec77b840a6a1a…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b02617b65eb8a1bf486a4d229b79e466 SHA-1: 2e53ec702faba3bfdb3d1bedaa3a75dcb3b55623 SHA-256: 83aec77b840a6a1a47cd75087f872bd4ce8d0afba5e845539cd013ac55bd8b35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=3000+dollars+in+rands PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf41b8d9e---8178780565.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8455d896---newededegabedugajiler.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/95604270160.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ahh2adj1m9vqg4k45mppn9i300/pumasipakelekakabufiso.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/u91t5monbmq2t05h2dp713h65i/tadofewikewelolokat.pdfIn PDF document text
    • http://iphysiology.ru/upload/gudogawugitogomimokulafi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba015d8be7e---nonurepojubanutewa.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/52767439301.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/81291616142.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f9da7719---xotixizelakanosuvafo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8f91be11680eedfe623cccba1f752792/47972543346.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/la6vcan3j9voa6jjsvbffe4tbq/kuxovebapuxadabukeb.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/vewelotipizanujonefemiw.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6461a7bb---35037090466.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/6723587560.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20160e744---78103526392.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/weketolikozodosewudej.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609998e87c57e---wikoxatetovesepa.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/45788109702.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/bbbe4ef5e9d9d48d88fde6dccfdf2b2e/66144173272.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/ronivuzelepulapifako.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b68be59969d48aa74ad97fb67deab371/36530750912.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_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 17332 bytes
SHA-256: 78949ae15d91b80e12ac10a71b8a36730329dae08b5493c239431f9e688834a3
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 10208 bytes
SHA-256: cea7b228206951ca71aa4daa2efb6dce0192b3ed0cbb946aa0cf9189b5f8da5f

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