Malicious PDF — malware analysis report

Static analysis result for SHA-256 651c624e4447895c…

MALICIOUS

PDF

75.4 KB Created: 2021-10-16 08:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5b979bc0e5b1d5b64a1c8b684aee290d SHA-1: 7dcaffa209a9a66448b08d826a468f6dbcb3d062 SHA-256: 651c624e4447895c0fb23d7bb243ceb6aeef5b544b7e66dc25be8da57f140292
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many of which are hosted on compromised websites or utilize link farms, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were directly extracted, the structure and heuristics indicate the document is designed to redirect users to malicious PDFs, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=dishonored+2+good+doctor+safe PDF link annotation
    • http://innova-perila.ru/upload/files/dupitimuwesuruzisotupef.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/dulad.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/rudezoma.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88383901386.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161490732049a1---zerutaxizimekowumuwatuzet.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/bolutesaduzukij.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/15117332511.pdfIn PDF document text
    • http://fitviewer.com/files/file/28726464834.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/41001420174.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83566407693.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598e11559ec---vupinomufikujovapug.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/midolu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614778bbbe096---lupikawonegawuresufot.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/34071632258.pdfIn PDF document text
    • https://petek.biz/resimler/files/98982302139.pdfIn PDF document text
    • http://groupkaishan.com/d/files/retuxowisexuzerube.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/42375368924.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4dde913f2---pewewibepuwisoniforulexu.pdfIn PDF document text
    • http://darec.sk/files/files/21611439982.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/81127160329.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/64008222113.pdfPDF link annotation
    • http://icsbc.ru/fuploader/file/52226521442.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/xigekoxuxetowatufiwaje.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/7752132091.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/foxufujiwibuseniriwozij.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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 10828 bytes
SHA-256: 48bb9c1770a23508fe0bef398030dc43dd7b512fe7e2cd069c02e75467687f9d
font_01_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16960 bytes
SHA-256: b182ca57be107d88e54c7990fd202862b03e41198092b8754f8c0f9612526ebe

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