Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd92c25b4847bb9…

MALICIOUS

PDF

77.0 KB Created: 2021-07-01 09:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3adcf7a9ceb944c9734d4acac8c68986 SHA-1: ee01396a853d486d748ed81eb14f0dcba98fe326 SHA-256: bbd92c25b4847bb9c95c5f65cc3439f5cf6c81ca72c5c6c2d5fc611c0113138a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607283a9c2da5---57673680007.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/64780895850.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/62e4c83a31895d8675e792b8f9191801/jibezi.pdfIn PDF document text
    • http://bociany.sk/media/file/3973778081.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a6765ea8a12111ef508b61ecafc17cce/22387747919.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/54cb84ffc3b3c491fd1848b6fee40b4a/75360672268.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/98088789069.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/25459044340.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4a9b52c875da1a009b40f1686746e86/dovomomeravukuxolus.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb5ab49a7---lenamubemiki.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097e0d1bda43---sevalasosoboronuvotali.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5a063c52---46515367457.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6322ba5cc5df2db33c90121b374de468/tapilagafevuxilegofove.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tuvesexogetanogenakutof.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/67732f6f97ebcd9f6c3b090a33836eae/lazalimujixosevamira.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d225c10761---69550658101.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c986aef21c---pazewijadiwinusageverog.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c6f0c14c---sabufalapi.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zumujibuzaxakalewasiw.pdfIn PDF document text
    • http://sport-way.ru/img/file/zagubizitaw.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/vinaga.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/favejuvibotatekasixazuzil.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mglo2mm65dagu600pdhrvmbc9h/62231892802.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8666c2c3d2b5c58ecd49145811fd906a/buzatejuditameto.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/huo0s8rp59fac7tkap9u7heie6/rakoviwar.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/todil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=combine+and+compress+pdf+onlinePDF 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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 16868 bytes
SHA-256: ef770c21e73dd996edffc1e1148e8cc707de2c7feb50d2e5c8dd582f32338ac3
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 10852 bytes
SHA-256: 6919fb56c4d7d1be2a79f7dd260bf80c8ca8aa3265b05e6672d2dc91696fbbfc