Malicious PDF — malware analysis report

Static analysis result for SHA-256 282990afc974b08a…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 12:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e7f91ed7aff8870d7e14620ac5e1c1d SHA-1: 18f7c4bd6269e678a04c9e8235945f072eeb734e SHA-256: 282990afc974b08a15b6caae63335ae2603c853e220a476cf461d1f3894ab025
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://nmcs.ca/userfiles/files/xirotizelunonilosered.pdf In PDF document text
    • https://partnermind.cz/images/files/71808335877.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/rexebikimemipipe.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/76d31e3e9da265fb4a3010ae99254b08/74172080919.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/23940937126.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/8492481935.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1020d01de---voxigigufojejo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tc2436n11tn36umnu9v20giau0/22381861812.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7b113ca83bd014636c4b7750940f4df9/ranaluwokeroge.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/padiraralakuloliba.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7a34a8b74b4e5d3af7c3ca3293a1b632/kesaxebadatenopal.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sozoveloxudajekozota.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/13262999248.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/74354262623.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b22157d5---koponebave.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/18654812390.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/vopumovujaloturuzawuno.pdfIn PDF document text
    • https://goodline.by/userfiles/file/faxetuxazun.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/84926297066.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868558d8807---vululatepegowizo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/p53sstv5p2c4a6a1l68tmh43g5/wusewugabutezuxonolinuk.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/76386598065.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/74904741651.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/kexadipodugukevawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ratio+rates+proportions+worksheetsPDF 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_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 18944 bytes
SHA-256: b4df971e05f45ec58b1b27e5d1d553d47432973e620a2964c128ee7d7c42fe8e
font_01_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 10524 bytes
SHA-256: c0b4f4fe63d660393c1fe21f3b6632372aed908daf525f44d86276422d07e003
font_02_sfnt_off00014c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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