Malicious PDF — malware analysis report

Static analysis result for SHA-256 6731cbac0f189e7e…

MALICIOUS

PDF

105.0 KB Created: 2021-06-27 15:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6d777f568fa5eaa7026efcab349a546b SHA-1: f82a50ee992952eec67b0920db7f90ea5d87717f SHA-256: 6731cbac0f189e7e8093aaeb0e5b11b3e87678f1c71cff540a502f0ca4c8500a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads. This suggests the PDF is used to distribute or redirect to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://muszempilla.com/files/file/95085990802.pdf In PDF document text
    • http://shosholoza.de/file/65407017255.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/52986737709.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cb5a66ddd---51493720366.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mafokawirogevadarilasideb.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3c4ec575bef0a1bb28f18a8bdb461637/63318129260.pdfIn PDF document text
    • http://tfforming.ru/d/files/72131179312.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c444f2e8d---15078702944.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pm0ph6ojgnji1egmtj5p2b56f4/fesisimot.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd474b88b---narobivarixovimezevimaz.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/patiduwapowujoxuvuf.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1c600f890e253e8e137c87831ae8f5b4/noroxedaferaxowiroj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a83befbc50b6f965b67686ef829d1a9/91548505573.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/27791685567.pdfIn PDF document text
    • https://mahae.hu/files/files/28630710363.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a86bf472---14228854778.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b533b622287c1de370b9c4c7772ccbfc/62190221654.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b64c11ce---51005629741.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ee91c060b---lilapawi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbc4d11bf4---79166443110.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/jovodegatemumerivokakovi.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/63189481865.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/361472ce8521bbc5daa84d2358124286/vowofesoxuleloluveniluru.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/83976781674.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724c8702194---15421822193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=percy+jackson+sea+of+monsters+clarissePDF 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_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 10836 bytes
SHA-256: c0d7971f119f697c7bc809296e73e55a389751cd9d4407fb219a39d12edbb296
font_01_sfnt_off00014f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F80 18400 bytes
SHA-256: 41cb9175e263e220008682aa8de25f7e92a1006334181ac61fa7e11d5463bc2c
font_02_sfnt_off00017ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1