Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd61443d66104e5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 07:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de09af0d2244b3042113d0ba70b837ed SHA-1: fbcc91fa4aa1295060b4f9398e13585316b6dbdc SHA-256: 8cd61443d66104e5ed81ceeeab628f95455d9f26a1f8385cb0f54ae7eb817cfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest the document is designed to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=magician+apprentice+pdf+free PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118199f9fac0---zuwimabimepijoz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c86e6d9a---33727782673.pdfIn PDF document text
    • https://soltendance.com/stockages/files/vetubekabumoseguri.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/botudaduzepiwifaler.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/badejolenawibatu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/95ae9ed0cd606578af3a456cf42d9394/82541923553.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e6220b88530fd01eff1854b852c0b6e0/sefedimavotaramarawonugon.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/50408542164.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/88092784469.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/veloxoku.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6rvhoh6cfbo8hbut1v1upc5lop/kanosituw.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/ketolomevuforanogavuga.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/50334700478.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/33215699749.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/lujaribenumomorusoxupi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/af396379eeb6258d8134db8cde82f2d3/tapusunevoxefuforeji.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/kexewuz.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/gatibura.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/begolurixajid.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084612a0c1f6---xivetob.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a897e426eca---lokatomasazom.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607602dc5b966---48934823845.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/87238648028.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 19604 bytes
SHA-256: 6d1cc20a9971de9aeb407a9570e5db2b36b23aa4a507aa5fda173848f006987c
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 10456 bytes
SHA-256: 3183887ec462ea6301f8e90eb8c1812c93feb87fc32d97e50308c8b09e715076

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