Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9fe0e594ebdcef…

MALICIOUS

PDF

97.7 KB Created: 2021-06-05 06:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 72ea44787eebe2fa26f04703d28dc3ae SHA-1: 49df2faefa56ed444e562d2f8bd0de2737bbcafa SHA-256: fb9fe0e594ebdceff14235440321be319bab16234eb8e5aca9dae5a272efde4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload, link farm) strongly suggest the PDF is intended to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+3+pcsx2+graphics PDF link annotation
    • https://abugfreemind.com/userfiles/file/17268934846.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af878b43c6f---14306901096.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607678f2290ba---jidiwunamef.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bbbc9ae3bd40a07447ec1e96b3625898/pubitolafopojenojexu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6e09f349---pirebobaxa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ab4443bec09b37715bee57fe629ed6b/kitejiwirumejenizezaser.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021053005375773499.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bd13a78bd---84051348947.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a9b9fa09ab7b68a54c581bea7fa1ab8e/53186383288.pdfIn PDF document text
    • http://renovator.cz/files/file/19362305565.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1dafc8460---xatuxipixuduzivafimenov.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/juzemixovaxoxufimusuto.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/begevud.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9a29c60f---kiverogo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee26e1a1c---48197370802.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/90304120902.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/muvefuwape.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c1a3a2fde0cfe08feb3b00f9c9cbeb4a/28170439867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 4088 bytes
SHA-256: 6d26768c6ebd9a68380b695b1865814c4c3fc0ae4144edc940d1949c4c5a5f8c
font_01_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 5836 bytes
SHA-256: 6cb1f20e846e563961e438b0ac20aeaf0346eec5da1db456814c9567a40b804b
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 6164 bytes
SHA-256: 9096d6b56971d3bb1f659069fb87078347975d27a8e6386d112673576d910b33
font_03_sfnt_off000140b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B5 12532 bytes
SHA-256: d9f03d2a90a7423179cbea95407d6c1d93b6ab6f49b8dd57d7d01be528304e18
font_04_sfnt_off00016a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A27 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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