Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c5d3c8a1624920…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 09:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78040970890b0d1063a2b98ea44b4d6d SHA-1: de9d6786105aa9eceb9997971571ea33fc7302fa SHA-256: 65c5d3c8a16249204c936afba7f897bd4117c8dea7523d757a532d9469ebe279
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and embedded links suggest it's part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135992909266---xerafuju.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dafa6ea15---2432932407.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/43998266615.pdfIn PDF document text
    • http://belniig.by/public/file/salosizemupezusufaleti.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142d721675e1---1190247966.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/79413107612.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/javopusimanize.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/vibiwarabo.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210904075601564.pdfIn PDF document text
    • http://halaljones.com/uploads/files/19480140007.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b31c66ccfbd9f8fb5fdf6af281f29919/veleted.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/80220201912.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/64260368577.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/440cc670e607229321f9903630dfe9e7/43527912949.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/samedu.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/dudibazidozudeselimag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130520c4882b---63415759803.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c66eeabe9---27083368441.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/56669496487.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/97085414726.pdfIn PDF document text
    • http://methese.com/upload/files/80303846295.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe073628e---14194739732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=let+him+go+filmPDF 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10084 bytes
SHA-256: 05b5a145bf407046a698629be8214f2a7ffa7cdccc567fbbac7ac564852ad41f
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 18180 bytes
SHA-256: 39f827b42245bd845846c62c508bcf6017d51132a334a21b5bfab6a595388c79

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