Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ab0c1b6290969d…

MALICIOUS

PDF

108.9 KB Created: 2021-08-11 01:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fea12db89be07815ca56c979316c6b16 SHA-1: e609fd562ccdfce5432f98cc003f8818d45b6685 SHA-256: 65ab0c1b6290969dffdce7eb3e53773f9571486f6842fa122d1958173513ff7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc7203afb---nukud.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/81c50cef4aaa1b06598d310493676eeb/lexoderoxug.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/58413677079.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c2b3a84ecd434d69238b425ad411b19d/20859007046.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/joteguworaxeduxore.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106152057211316.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6d69c348---14563013891.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/88b23b65ed063b842100e8c90eafba3b/42256962598.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0565km151tf1oolnh7mg9id175/lunivodusanefizurekipox.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c0vhfvlg5kk1cij71jk8pihk0/digofilidelinetidamutaf.pdf
    • https://506hlapeta.com/files/file/takejuzumuzederi.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c06c25621282ea1a55a8c2bd51464d0/27653277401.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cc70f4da7ae---84387971414.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2f5463ecc249cba0b09011a908167b34/43044761081.pdf
    • http://sun-green.be/ckfinder/userfiles/files/67524167761.pdf
    • http://kavtas.com/images_upload/files/nibudugezonunekakejof.pdf
    • http://cathugo.de/res/wysiwyg/file/53119744272.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/966f72b41b282677b31597042384cfe6/zomawuwolide.pdf
    • http://ridendo.cz/files/file/pobiz.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e4d7189e6d9ee511eb2533929b51498c/9685483823.pdf
    • http://szao-spb.ru/images/news/file/40134158414.pdf
    • https://bilegt.mn/userfiles/files/65021147542.pdf
    • http://lindendirect.com/tempimg/file/83039862525.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=exerc%C3%ADcios+figuras+de+linguagem+vestibular
    • 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_off00013fe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE3 16792 bytes
font_01_sfnt_off000157fa.bin
5f054c597e4a9913c878b831d2f328e76b8caf5bb8b25ccee6f3be78fa2ff837
pdf-font-stream PDF embedded font (sfnt) at offset 0x157FA 11272 bytes
font_02_sfnt_off00017243.bin
246de2e4bf17d8163373811607fc4009f47c0ab04570fbe3305de244d1c9286c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17243 20092 bytes