Malicious PDF — malware analysis report

Static analysis result for SHA-256 7113f35902da8aad…

MALICIOUS

PDF

80.9 KB Created: 2021-08-27 09:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb1b8bb1ef8686004209165f3e403a40 SHA-1: 88bb8568871d498f8e403ec9f3e6fc1d5c3a7b24 SHA-256: 7113f35902da8aad17c6df279073ccc36bd9ce73055f79fdf00476b1c717e10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, including those hosted on compromised WordPress sites and disposable domains, suggest a phishing or malware distribution campaign. 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 0.9949

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://infrive.ru/uplcv?utm_term=sherway+manual+therapy PDF link annotation
    • http://hungbuloon.com/media/ftp/file/57455725094.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26b66a5ad---28976767542.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/66742263966.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/75237548245.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d703247d1---82540271491.pdfIn PDF document text
    • http://yilip.net/userData/board/file/vumuselavibu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/ponunumoxanumuwax.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2812c011a7a7f583c850271f8ca228e5/telenozanofag.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811b7383e95---kovonutitukiwikapasu.pdfIn PDF document text
    • https://limsurempat.com/contents//files/jejarugulovexivukuzemitus.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e79389d6c---dugeni.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/vifomagexixorajarigawenez.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb691c65e---putebugidu.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210818095134_1761734399.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0879f8641e0efba96baa85f2f09e311e/rimazixisugibev.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5411b09d72---46014340750.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/80552217338.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1a31a4bef7a95782825936e329c090a7/zefawudexoselejuzexi.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fazujufuzebinefusuvu.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/23495208039.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/zipazakete.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210516045355.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71249920473.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/2016609059.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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10512 bytes
SHA-256: 0dda758997f307b873b55fc5d2d8f79b1d619c2727324534886e60efed8e170d
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16188 bytes
SHA-256: 230566bfc5f9b0420ad980ebdd79b488d0d90caeda5c0a1fa5fed685b2ff7149
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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