Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ccd6ccf6596347…

MALICIOUS

PDF

157.0 KB Created: 2021-08-08 16:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d5c5033aae7b52a6992d28bcddaaa4c SHA-1: 3769a0fa5c977213d9132332ba448944a6db2996 SHA-256: d3ccd6ccf65963472a4bc73ebcc4242240ea682b7564c1f50c7fe5acefc63996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites and other domains, suggesting it functions as a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc936fa2b---xipudibunaradonaxi.pdf In PDF document text
    • https://autonoleggioassereto.com/file/88272632383.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/72166147100.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/v7satkdnu1cpfjt4otl5j8f11i/44375087466.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/bokejegezoviwowisam.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/60639872269.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/79281289049.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7499120de1---towidevarelizegu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a026580e979---xifafebenezavites.pdfIn PDF document text
    • https://drlanda.hu/user/file/70472162802.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/naxotejuxizekav.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tnp01db7nrksgi17ihd5j2nt53/29597207053.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/menokixi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a434064e4b---xabapafubi.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/99034086624.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/970d5a9b003c064ba32904fcadb3da99/94648130668.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/nunodukogulapa.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14260dd4c---61946142553.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b048d310---batixekares.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/86355520111.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0989j38tmr827blims8v9saoh7/99472639169.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d383f9079a6c38481b63171a8ee10333/tapabonuxilupoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aladdin+story+book+authorPDF 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_off00020b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B44 10640 bytes
SHA-256: 5e181425700fcebfe6b636d72e4719386554a3d5f6f9442d766efc18d107e1b9
font_01_sfnt_off00022389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B9B 16232 bytes
SHA-256: f0045c5715d1318cd505222d9963181e982c65418b8e70efe18ddb0c497f4147

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