Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63771c46f62b64e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 14:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0df8345402d1bbfd87baa677e6e41004 SHA-1: 1d3c5dac522f0dcd736c2f8a06523e3df5a32578 SHA-256: e63771c46f62b64ecb93c934aaca91b76dae7373f6ac8e8f09296e9a4a76cd89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ceresasrl.it/userfiles/files/fasamubasixuwe.pdf In PDF document text
    • https://bursaphotofest.org/uploads/files/83476593295.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/semunezetutaketemajenif.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/79997438501.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdc8b84b5b---68750657088.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/4669233919.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/fipemuzejilopemuvodap.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/sopanuginasuxodipos.pdfIn PDF document text
    • https://znalac.com/userfiles/file/nezigokebafizezozikov.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kalujejemadi.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/55817310174.pdfIn PDF document text
    • http://electric-kernbichler.at/laviweka.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147050258967---borebiparuf.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210907221102.pdfIn PDF document text
    • https://kultmotor.hu/images/files/18614273186.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zidito.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wazagumafijotoresonoxata.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/61206978000.pdfIn PDF document text
    • http://lordwood.ru/images/file/51399177926.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xezuzawumilenugoliwog.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/79897770335.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/449aa5b3fc7e7cfaf164cae955c227b3/banoroduji.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/4296772945.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/96948932980.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146a598d1751---duzadaraponeraniligimuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aus+v+nz+rugbyPDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 16556 bytes
SHA-256: f9689721865ba9e64175f010b1bea7973b07d015623780b5b39af7a7991185a5
font_02_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 10096 bytes
SHA-256: c161b8d96ece38f50285513360380c16262ffaeb2308b2cab377ea532d944fa8

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