Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed1e33608e82221…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 07:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2c01b0665d9145dec64308ef7ad1645e SHA-1: c2bb95b020aea8a5e6d608f825ab9da252076b84 SHA-256: bed1e33608e8222132b4492c53ead5be0e75c76d912bbc147c493155e8dc9b11
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest an attempt to leverage compromised infrastructure for potentially malicious redirects or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/aoc67orn7mveofekc4lsguflvu/45752535494.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e13259626---45074142710.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xigufewalekofi.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/39944218324.pdfIn PDF document text
    • http://mosjob.ru/images/file/luwikagefonese.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2da2c0f3d---ledujowumowasi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7c47a843dc0ebc00f365c50f05434d9e/jenamojiberexokutegitajen.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/83064605704383efc258a209b1bb255a/davizabinido.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/23794010322.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee670091c---70333577392.pdfIn PDF document text
    • https://morabia.fi/images/file/4837763687.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h4ch534hgrutqq3hlmg7it8pmf/wekoluxedutanaketifupivev.pdfIn PDF document text
    • http://oodow.cn/upload/file/210614114618083151a991vstwtk7i.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d6090492ea0---34100269910.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/4f5c49a2cde3678e47dc8b975b79fde5/11763600929.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7576d7c6---wiselofajumiz.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/domonagisa.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/430b17949aaa68f76ae10dfb60a8fa76/kaxobeso.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210623195709274088294.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/97827058275.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/20798279783.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089084580ef4---87755867414.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/37207209775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sathya+sai+baba+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 16580 bytes
SHA-256: acaf645c9358fe8154a44fbe1689d03364c0f3daae5beed7c405027c2d3dc282
font_01_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 10960 bytes
SHA-256: 3e4c61902913747d6a7930099429073aea60bca085c806f2100de7b2f0a81f0b