Malicious PDF — malware analysis report

Static analysis result for SHA-256 040b97bead5f6129…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84178211e91fd361ce51fddcda47591f SHA-1: 296a900a8f97990e28ce99ad7452c483ab6ebdf8 SHA-256: 040b97bead5f6129a0513c3cbfb67b6c3efb78dec3e5360506ab15d5bded9ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://pooq-design.com/app/webroot/fckfiles/file/81699611077.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/rinutenanilodasuj.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/doxivovetobosuzamifobu.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/49686436392.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c64d11a9d3c729c6d2c14302e4a30129/mifakaxazurapu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/72752619130.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/14055836471.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/39130778422.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81629585961.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/digutibusepedo.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/pexajakofuxodugut.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/58095604365.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/77113976642.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693fc19da2---86920587019.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/nifota.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lubetegirepu.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/vapoponojuve.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161404d727584a---78025658405.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/wevoxoses.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/61456178024.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3e7a17279dcf070341018e7b544472be/63376980760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=google+play+store+descargar+gratis+para+celularPDF 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_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 18000 bytes
SHA-256: 97e1a4b0f7ac3eee40a4a9fc6c53f7534852304736f298df2e90383aa9b1870b
font_02_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 10836 bytes
SHA-256: 9e1fb5d85de79d10f9c9c2ed59f41b64bf71005186536d1c891a718bcf964b13