Malicious PDF — malware analysis report

Static analysis result for SHA-256 51edbc1f10eddc5f…

MALICIOUS

PDF

107.9 KB Created: 2021-08-03 08:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8d50dbbbe2574b292fc23502ab82e4ad SHA-1: 3bc18d771c5967943e5543b5f4499fde3f1a0c58 SHA-256: 51edbc1f10eddc5f3ba60653f4743a592c50418c05144d13ad88a37a358b6e78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging a client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fc777b3hlgarqliqn83mm2op6c/jixededelemugos.pdf In PDF document text
    • https://weeb.nu/userfiles/file/19319315508.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f65d6d0c1---diwive.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c604f81e150---vaxefejaxerukibabirijavi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cebe365f91b59c48c316a2bc4331b3f5/85979934404.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/finomupatarijumifozuk.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/61131167512.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/e8a6e15e6808b9f62dd372949a6a0364/pemipotaxixoz.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1kuojlvilu8264theud0n3d1bk/5913084820.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jutefalerejolazufemalosip.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087139290670---japifavojopobamirova.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/navegagafebawirolijiwa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/k76kpi08ostlr9lse1bql27j0n/79365022050.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/kijekas.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6704478b337a22aaf7aed87a001b5dd4/sewapopidowigokafuso.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a2521cd6142ebb7430f554b1d7704814/41994813489.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/dawomixuvasiduninopoduza.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6406c74f9d129e19a7f7a8bdb1996e67/7356073970.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0751475001625640726.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607002097546f---lazedigag.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b66e415a0---dorugenut.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/76e14d634b13e77762934c7f3843731b/kijipamizibefenizafol.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93407492977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+the+joy+of+creation+story+mode+not+scaryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 17880 bytes
SHA-256: b92f915fa36939e8a60a3cdbbf20d0b61c1d2238f939448025e432fa69420275
font_01_sfnt_off00016f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9E 11108 bytes
SHA-256: 6bf6bc1126280a0834ad8949cf7817d33caa536c4ec4360653ce59e55298ec03
font_02_sfnt_off0001895d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1895D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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