Malicious PDF — malware analysis report

Static analysis result for SHA-256 6072b514ec30082c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 11:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dfbf6beb2b9d1fd8dba7b0df8319b04 SHA-1: 28d9c6b6a2b187b7beb9d7b57f7eeb86a3423a6b SHA-256: 6072b514ec30082c36d4b6c8bd87f27d65d9f284bf370ad57abf3747c70ac2ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious and uses a remote-support tool lure to trick users into downloading a payload. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://oniceh.ru/uplcv?utm_term=four+finger+g+chord PDF link annotation
    • https://eetravel.net/file/86008170176.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/44965432415.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/52445463995.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/60272587207.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72223757117.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/36141540499.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-23/20210923053056127497.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zobabalegomubo.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/lokekiluvowuzuxagenegam.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/72141272394.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/bejufagifusoxalogajeg.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/meranakikesoxu.pdfIn PDF document text
    • https://bdata.vn/upload/files/36591828790.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/85830485921.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5d2fa3d9d804635aeccab4d766a924c1/88207572595.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xozolutuxaxafadigona.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/zagatiw.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/44428307693.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161488a69eefc3---vekatowilapigopedibaliled.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rirawarizupesatife.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/nexexonanijagedira.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/57523890481.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614819ba9aedb---8002105376.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/45694196531.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 18860 bytes
SHA-256: 30c5bff35a90189f753a0467b4758292ce52e3d29bd089d6835b6f00a3e86384
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 10360 bytes
SHA-256: e92332bd2df59f3199fe94ee4452018ffae934f6d0f433909acc7acd36b3001d

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