Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f72ee381e7b96a7…

MALICIOUS

PDF

78.8 KB Created: 2021-07-03 13:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbd6e0bb6e45cda916f9458ca363ffb0 SHA-1: 307b3db1c762e4eb98f2fba26d7c4ed35b5f916e SHA-256: 4f72ee381e7b96a71e6698094f10c8c7975cd107db0af8c0f885ef82c0c7614c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/82b6b4c4808403b274b353c27ce428a5/19203517968.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/o2c2u36t855qpn25g2iej9bbop/goxeve.pdf
    • http://bhs-class1957.com/clients/35434/File/72447548986.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/haupjtcjjo87lokj2vth73qo0k/31804789641.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/15772050c5364061beedb7bd6b30ae1f/wezexuwuxider.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/134cc45611fdc13205528163382b1a9d/xutewunidizazo.pdf
    • https://alihuata.com/userfiles/file/fivafizurupemetag.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0c963fb3---vewovinujewa.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/lukofeno.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jib1tqk1udi3i4pg1sn1rk019j/76980555549.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17d82dc896---10837766323.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f293f80e---tugudewugajodexiriv.pdf
    • http://hocikto.info/userfiles/file/popimoludiberapad.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4b73ba678561f60253cc9620cfe4fc11/36845218602.pdf
    • https://soechi.com/userfiles/file/zebodovasovob.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608804f31ab3c---25320661609.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb579f8b311---97818853980.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6a32e4fa415f9aa2a24b7df8bf44327e/fiwogosivijiduvuzidu.pdf
    • http://chi-kara.net/userfiles/file/76225094496.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafcaedf156---24280956176.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/14548336cd65043533b586f909d89484/zuwinozumu.pdf
    • http://sllight.ru/design/img/upload/file/14275856055.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893d99e0179---juzazesikaxewetof.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27aac85f5---15153783700.pdf
    • http://allprintusa.com/admin/images/file/83327938666.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+color+do+you+get+when+you+mix+yellow+and+green
    • 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_off0000cdc0.bin
73fb6da4485242a98040d75f315f3381a94e2539bcf3a22dc2f3be0d86852171		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 16960 bytes
font_01_sfnt_off0000fa10.bin
4abf8b796f595d4cd82751e078cc9e1620f3facbd888810de894cf67b919266d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 11044 bytes
font_02_sfnt_off00011371.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 16792 bytes

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