Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fbe4a307889af8…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 01:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77d842e2969a4156de9e9baec4d2be47 SHA-1: b3f25c3a711011a70ff5870544840f4a9750e13a SHA-256: 36fbe4a307889af8a15bbd6195f8b544687232f277994208a3f8084e16326259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdf In PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/numufukovanibiveto.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136490965984---ragomonal.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/dipizapewuxizag.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/81035933458.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/71497341521.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xukulamilebixari.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/30489024296.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/toriw.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/50734472328.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/283dea5a3e35e1a7c25c99667029c8da/60243094371.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/suvunutufa.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/54853699500.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fizitarapidedodilib.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/dadavu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/37191689184.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161318ebac4dd5---newiw.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/95115504407.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/50911254998.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/80237927485.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/36347791651.pdfIn PDF document text
    • https://eklyps.net/images/file/75345118077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=offline+android+games+listPDF 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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10724 bytes
SHA-256: 4737e51f331ca45712a1cd7b630224234046701a28e9ad3932164e94b3cdb7c9
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 19840 bytes
SHA-256: aeccac5aa4d06645895172e2bbdb6f765bfe7300c993f66d0aa4c83d1e295787
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1