Malicious PDF — malware analysis report

Static analysis result for SHA-256 8498c10333b462cd…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 21:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3df65d846a9775507b95c326f4cc3e71 SHA-1: 5e48199d975acd6805b9d5cea7d0de3301257be0 SHA-256: 8498c10333b462cdf9c7ba22cc8280078464bee53e2a99c7f69363a2472f2f3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential harvesting or malware delivery. The presence of numerous links to compromised WordPress sites and disposable hosting further indicates malicious intent. Although no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to exploit user trust and lead them to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=exe+file+opener+for+android+apk
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceec06550d---guxofapetepupivafudimo.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05fe6240e428e7708e241f3b2aa5c71d/16263219842.pdf
    • http://bagiez.com/userfiles/file/94441500288.pdf
    • http://longvu.vn/Images_upload/files/328857694.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/06e4bec90c3cb88a4706b2d5607f6353/12027951774.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83d0ec162c35b5003613049b8db97c8b/64912914582.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/6abd6aa93508a5f78bac5b1561d0949a/56519368400.pdf
    • http://goldnumber.info/userfiles/file/8852233104.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/94b1c8194a2b35d71897cfcbae1a3d58/60845995032.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54ccc841c---52879155712.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3fa330fc---31731449244.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc569686ab18daeef29a62fcda43aa1a/vijotoforuniv.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad669bff9---21026186943.pdf
    • http://montagnobozzone.it/userfiles/files/lepefonowiza.pdf
    • https://alajuusa.ee/media/contents/file/51736999973.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160825ec94baa2---65485083155.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82523b2e7---somelux.pdf
    • http://rbtyutj01.com/userfiles/files/bufali.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0f2732c6---92490259663.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/93b591b7ae20a064b5232e8d47ff9f3e/mebijipinota.pdf
    • http://adabaskimerkezi.com/upload/file/wafobumojipinotepobofopux.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2af56f4c---davoz.pdf
    • https://cottingham-group.com/cufiles/files/kipokexaxamuzopijosafof.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/43116353841.pdf
    • http://firmen-bekleidung.at/userfiles/file/nemurezesituxedekenipipil.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/672f0f95d9ddbd6cd796048098ff0b04/7213803438.pdf
    • http://commune-bourre.com/userfiles/file/61246386891.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_off0000f795.bin
0c64dabb867a644142094e5652cdcc9601a50a25ccaefc65bca1593eb86d8d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10400 bytes
font_01_sfnt_off00010f22.bin
aad5092120104f37e158c45d82ba48772d48ceadf56619082b0ed5e373780905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 17444 bytes
font_02_sfnt_off00013cc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 16792 bytes

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