Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c7fe04b9df8de8…

MALICIOUS

PDF

105.8 KB Created: 2021-06-27 19:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f4f8b4dc2b72cf3685ce4fc60b643d3 SHA-1: fc734219a1a1ecc55a333e87467ca7eff1bbaf43 SHA-256: 36c7fe04b9df8de8a77276dc3364156ad694bd12bb7dd79faf8d4f4e9dc5640c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49f16c671---16672419997.pdf
    • https://pet-fashion.ro/mm/file/92806324837.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8155f590b5b88174b8076c62ba3e5e3e/27943034941.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gij705v25cnnv6f7go88tot0k2/39475889861.pdf
    • https://syntellect.ru/Repository/file/82207962337.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742dfe1875f---nipalaboxe.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o3d4j9ejt6coj7l9qhagu79467/67290629546.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lukivujugup.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/19766fa4f34e788f58a322632d467ada/7458572978.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b16ddc9f8c7468409973b2f764545dc1/bezolojobazilu.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210623083447.pdf
    • https://abofahed.com/userfiles/file/vumuxudonivudejatelefox.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088673c6c62c---74142823881.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/15256658494.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8a6b2551fd88340f03dd71437c3c237/xarugon.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a050b25c0cc---vuranujuwunoxotutoda.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7e6ebd0---tekap.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce97d06f733---pidarusuzisadasozab.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b2f5968f7---menebupevunanemi.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ojf93k8t54klsqf9ehuq3m69jd/pimanitaxulajaremarot.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/3d0ce4e3c43dc04bb3df2156f79fe358/88221248745.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b40a8f30---wipalorejeferukusuxiraw.pdf
    • https://sasalidayanisma.org/uploads/file/97366844886.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9a6f98014b387b726d71c35fe3782b0a/tiwavitorisofumufu.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d0a8f08d---93410122047.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ae6042df---wubovilag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=translate+pdf+with+pictures
    • 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_off00013c64.bin
de89d15c28b4737f020cf69791d6a6883d8ce20edde6d730241dddfdfe3a2773
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C64 17164 bytes
font_01_sfnt_off000168e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x168E8 16792 bytes
font_02_sfnt_off000180ff.bin
a18b812df1277050051bdf81584362c3c72163e8612d7015daa2310e4b9239d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x180FF 10748 bytes