Malicious PDF — malware analysis report

Static analysis result for SHA-256 8634bf0cf450f639…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9e2b773e35b4d0ef96c2d3cbf735b8f SHA-1: 2ec7465f1cece724466347a89b916c2a474f77c8 SHA-256: 8634bf0cf450f639b27edeaccfbca2feb7445099bd3e0b8a935588657556ac77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=fortnite+on+android+phone PDF link annotation
    • https://harrisitalia.it/uploads/file/60328389036.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xidekigivo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/81037207899.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/43868471263.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/riruzapomexix.pdfIn PDF document text
    • http://parfumland.sk/upl/simebugakovawojelu.pdfIn PDF document text
    • http://kunbot.com/upload/files/lasotabax.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/81881577330.pdfIn PDF document text
    • https://laps.pl/userfiles/file/483594945.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/tekemizupuxep.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/17309788741.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f88d0b1a---kajobizidukadasa.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3519456090.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/35115230573.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/megarisisemubonirek.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c79eca0224abd28ff729c92ae6e2913/15414392981.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/55182364960.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6943554de---kezebufubiguzor.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e898550a2---23217128633.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/goxapok.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6ed876eb---kugenevewisilitixusolek.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6582967839.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae66e5aaa---37175617972.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_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 10252 bytes
SHA-256: 8af7b77e3c9bb1ef228db7d067cd2800d76980b60f203fb9cf8db6c44953690e
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 17160 bytes
SHA-256: 13f6ccdac71b355bcbde47f6ae2b64b34f30c2b2590675a788f847efa7b2b733
font_02_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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