Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9a0510d15ea0eb…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 09:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 962e2fca9c1613ced3813361ec247d47 SHA-1: 4093c59930630e9f407380f858e0329c104d9f14 SHA-256: 5c9a0510d15ea0eb6c12718a54dd1032878b7288ed8588ff004c9ad7bb3c0458
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to credential theft or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/4c66ab86d6459d10196f4ad1322315d4/fivasorewasazutogadi.pdf
    • http://studiolegalebisantis.it/userfiles/files/kipusovajo.pdf
    • http://fouladsazanco.com/Upload/file/nigedarufulepilejire.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b25b93ed---91366417475.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d915906bdf1b48ed85f2b23bdbd1100e/satemadimag.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/newon.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mor7cfdcbi3762iigrfhof7dcs/widuvet.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5439174f58faeeaf95e6bb6cd51c9895/55954470935.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19ffa1ea0---53292901910.pdf
    • https://audit-advisers.com/userfiles/file/7932851065.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nhgnjrf2pbg99cp1nco9g4oot5/samorijogazozejuvapufemof.pdf
    • https://x-software.cz/data/file/gagopesudox.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc23856c1---jabudufilugimunoroxik.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eb63eb0969eefffd56ca4fd8e4af142e/keburavugovidozuvoke.pdf
    • https://aplusadvance.com/naver_editor/data/file/kamipesujijatopib.pdf
    • https://1877painters.com/FCKeditor/file/57168898982.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5ao7c1tfgerctism3rhlel1j06/42128696792.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/59f5045f04c7e64263847e8c2474e789/45612759022.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078409916e0d---zisidujawuzisakedevo.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ja7gv93233c6h1iomf8mk0g65i/81521950303.pdf
    • http://dragonera.cn/admin/userfiles/file/93407125582.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732374bf31a---1464297234.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719dced1f08---sefigoduzesakojadatila.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cubicle+office+furniture+systems
    • 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_off00010395.bin
f7853601ff9272319dfcab4e19a79e8c61168999bce0382e079b22dd28b87cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10720 bytes
font_01_sfnt_off00011c3c.bin
eabf9be736cc639078e18f03905a97531c829cd6aac580e65ed9b3c6c98d85b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 17892 bytes
font_02_sfnt_off00014b3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3C 16792 bytes

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