Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d74fc521e0e877…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 17:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87f19436eaa9b4ed6fdeb474baccafde SHA-1: f0eb33d2505d7d0a665169e00ef1ebdc023d65b2 SHA-256: c4d74fc521e0e877e3b9d0c91f1d92ce8c843a7d5ee5857920678ad7d24ea38d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely serve to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://grandchainfamilyfoundation.org/clients/85333/File/10875159231.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3e7bdcbc1---sorigapexugi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902170218.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mogemipuf.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/68519561895.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xamiv.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/47451136055.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nebuxisijakimopeluwunuvi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9715b8d73---jubeminuxigagunotuwiziz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d522e2d03c5c972e8ae8ded45c0d2497/73369882634.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9f5eac4e---batomimajam.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bfc0888de902377ef2ee394ec854498c/13295477736.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc498dcbf---83240738836.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/7665837235.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bab4c7de146afb19a2c240902afdcacd/28528248370.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/67a3cdff89bbfcd9909220f33ecd3a10/57381607963.pdfIn PDF document text
    • http://glassick.com/userfiles/file/demotowikaviwejutokawuzu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/99630591585.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/44566525762.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c911935812a---967503548.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/podid.pdfIn PDF document text
    • https://amblamy.ee/upload/file/duzuvadigere.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jvrgjqembbsce5rv6r4997jmsj/zaxazaso.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/10830790777.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vazobivowezosemewofidisa.pdfIn PDF document text
    • http://gabortech.com/admin/file/63685042651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dimensioning+in+autocad+pdfPDF 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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 18300 bytes
SHA-256: 3f07aada4176d5b69675b4969715884a477177bc5ce03037cb3d83b56072c025
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 10916 bytes
SHA-256: 910b6d070924c3c2cf0a6cdf93541ee499c4442a2e1e35182d984c292ee6f5bd

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