Malicious PDF — malware analysis report

Static analysis result for SHA-256 f807d1de94df1faa…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 05:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e197883aae9c0533459a8ebd53557ab0 SHA-1: b88ab4d1befcb41aac6eec6a17f5a6e2aa08c446 SHA-256: f807d1de94df1faa44852e48a2e970c45e95df87a5e14db1a1b585bcc1ff8656
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.alex-vasilkov.ru/images/wisdom/file/pasaluzekeximimiguwe.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6cf1025d8941ac9d26c55655b726b56e/79207198462.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7ab66d7db---17079079684.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/55760211951.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/lebidak.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766afa7a9bc---12809895896.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/97405022793.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/69789504365.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/68060979966.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/17539165819.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/2001901355.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/60240326964.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c3cb6531---nixadudasozukinasob.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/koxazufugu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66e3d039a57a53fdbb1c23476b54427f/wosogujijowosidowagudov.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/lezonokokawipufidivunu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/oaejgb3kkuojei72l145ebsrio/majaxet.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b1769f5ad08253ec87a17b8333e512/peporabunitakuzotoxe.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/82533130822.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/quvjgh0avor1rhsl9equ8taikn/kujofujalo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160712d97c3eb3---45231660830.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/26406410163.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/tirakozedizuzefedi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/13293966053.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/leparezurikifovejo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612152432f22c---mitokoruguturu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hitachi+ultravision+tv+service+manualPDF 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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 18312 bytes
SHA-256: 8df0ead33d5c7abb4aa426e60e18c50346b03e89509690ca5b9e9a3c6435e54f
font_02_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 10652 bytes
SHA-256: 2c4eee87c9701475006ca000a0d215ca4dfe912baf4d9ff3c2b35c07795bec94

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