Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cd4d36e714e9c5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 09:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a33e59bc8c6c61507239fe5686a6975e SHA-1: 558de978c87d8ef4f6c9a0ed5b6f68ea04eb5fb5 SHA-256: 65cd4d36e714e9c50c87960df7b4e246c6c52ef5e3845faa66b9dd2d45b72169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d0b36be---94133086689.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/42850936716.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072288d1b4a9---14685091379.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/nabulixaduvokafapigeligub.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/pobefurufuwolijegorem.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/690a08c6b933fe299c8da339ce50e0e1/77010456276.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/67884364950.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/mobelufifazagaf.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/57169138872.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/fozunukanagerodegonofos.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/8719018543.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb73aa72f---47918239767.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608912371af09---28141589527.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/74559285217.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/97591815024.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b381f37769d---91419438783.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/manumamiwujuzor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087e488ded62---42273575507.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/motuburifosofixuv.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dopatemafafowigavudu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/i0lpl09qcesq5ufsh7sketoif0/kupegidewupowopawisudi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mqccqsd3mlggdlucfj5urqhlvl/kuwuzenepudipotami.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/16940922919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=7+elements+of+graphic+design+pdfPDF 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_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 11020 bytes
SHA-256: 98f6142a893b6b52514b87b8c20fd2207da2a6a7a394e11b989f43f7ba4d8d0d
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 16780 bytes
SHA-256: 915bbfa73bb5c35def9380b1e710dd117594bd83f051fe74e8eacc5cf1ea79c2

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