Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9af367fc0f67ba…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 10:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 023f2daea97e34c600a73a42e1311456 SHA-1: 3cd8a27b89b7ae9f0b8577fe76bef13527e552d2 SHA-256: cd9af367fc0f67babb05df5f295b6f49e02208c5996c1e5c462dd45fdaabf909
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URI links and compromised CMS upload links suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=how+to+update+messages+on+android PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b55d0ad62e092b7ec5b548e3e950d650/mujimuwarasib.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/dolanugilugabasimuru.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/52331045678.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivevebelaxe.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476b838edf7---wawajizawa.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161347cce8d550---jober.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/24016849530.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/nekebijuzon.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/poliki.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/joganulerizedev.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/398d40dbb7da50f16b4fc32cfd756970/36855313066.pdfIn PDF document text
    • https://iwistw.com/upload/files/76243545208.pdfIn PDF document text
    • http://thegioioto.store/upload/files/minajonomuluv.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/defuduzaxitefofat.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210919file///57957993501.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/1580644637.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/21896648027.pdfIn PDF document text
    • http://rnralpha.cz/res/file/sebedujizonewu.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/75017162160.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145f2d23fdb0---21499937434.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/79448557630.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/balofodatipad.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/mujagumani.pdfIn PDF document text
    • 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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 10864 bytes
SHA-256: 841909788dad9a189bc43e5d78f81d4ff98bcc11e6d999fab95118ac24ff1ced
font_01_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 18088 bytes
SHA-256: 5db7db99c3d8cf2aaa4ae90f05af705046c263eaea3071404647cf515b4483ce
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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