Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea1e4d8e19ae157…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f72d2cebb9c9f5de19f54a1f3a3af6e6 SHA-1: 1b74d7a6ccae8d296d21140e59dbb0628eedf2cf SHA-256: 8ea1e4d8e19ae157aa571731f85e05388fcea681346a0ad1cc1aae4c04a35323
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=world+series+of+poker+mod+apk+unlimited+money PDF link annotation
    • http://sake2metustin.com/uploads/files/nolovuzidaxorer.pdfIn PDF document text
    • http://www.pvvc.cz/files/mimunazogisutidejivi.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/53675468296.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/paxukozetodixin.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dekufelasoxufeva.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614517a9a21ee---17243866422.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/59802040051.pdfIn PDF document text
    • http://chinalabware.es/d/files/gerusifuxuwesimet.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/4641574362.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/kibitimivevukipokadipisaf.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/77749006347.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/62856757643.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/kotofududekojinudizopizu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/dedekeviselavigibadujenin.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/42237813720.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/47763459664.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/97351338699.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/nuturikugedimel.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/43123033508.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136152ac3582---50139865436.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7eb42dc723e8907334bb406a10a1a875/ganezupijedu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303fc138cf1---19833038254.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/nufagusosamitupakefeni.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nagijubiful.pdfIn PDF document text
    • 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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 17600 bytes
SHA-256: a1352a1654a8d0c1d27daa22884919e9a66cdadde4a44faa7f2d1ce98f86cddf
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10956 bytes
SHA-256: 5dc48e7ea1fa00ef72a3c0467702991529645a4429940592f1241212ef8fdba7

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