Malicious PDF — malware analysis report

Static analysis result for SHA-256 37219a69c5d357e1…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 16:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00fea7030f7f7756172ee91c20c15773 SHA-1: f5860874ab6907d1cc70aba45f39ed499f7f6b89 SHA-256: 37219a69c5d357e18a8735c7d36d41042f35b4188a05bfa85e912a9b73bd9d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://garglob.ru/uplcv?utm_term=simple+past+present+perfect+pdf PDF link annotation
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/24165142974.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/biname.pdfIn PDF document text
    • http://maxbrio.kr/files/files/95562053963.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/puburenugiduru.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/39435451789.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/saterepejaruzijabejani.pdfIn PDF document text
    • https://simorgh.it/uploads/file/wujepikoxutoxunup.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-4/20210904192327197008.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66395478424.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/62140171841.pdfIn PDF document text
    • http://telektrans.hu/editor_up/suzumufovodabetejo.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/36327619649.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/vunawarazegapabidufavamib.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/86272988977.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/rijuremubejalarav.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/32700366622.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kajimubokonubu.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/bivifuxupaxufajivizom.pdfIn PDF document text
    • http://fitviewer.de/files/file/fobenazosoparodivabog.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911035625.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630846545282153437.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba498b102---tilizesisigujawasinubu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b37e53c84f21173c2d7a535615b166bb/61778187053.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/34841472133.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cb3c95ef7c97a5cdffc726bee15074f9/bililabawotofezugoj.pdfIn PDF document text
    • http://scro.ru/pic/file/83568150415.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10736 bytes
SHA-256: b9d1732524bfa9182091a9eae39db301b9fc83f8c98c064a8906567f3975d50a
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 18700 bytes
SHA-256: f16677dc78ba6ddbbb6a2d7994ee4d6bbdf5d7d707899c6a5f1a208593d3e399

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