Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df33a2c8996d9d4…

MALICIOUS

PDF

203.8 KB Created: 2021-07-20 08:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f14ae6fb24033c88d34f21fb031e92c6 SHA-1: 13f04f9c64812f757def8187d3c19b3468df25e8 SHA-256: 5df33a2c8996d9d4c1c67c82cf4906211f4bc30d764031ed2bf21c05f0f23765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous URLs pointing to compromised CMS upload directories, specifically WordPress, suggests a distribution mechanism for malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • 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.
  • 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://angelojrobles.com/admin_initial_test/userfiles/file/99782318731.pdf In PDF document text
    • http://marsalanoleggio.it/userfiles/files/12618879266.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/mebojijiti.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dec54369---dipax.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/roginerezuzago.pdfIn PDF document text
    • https://businesslife.com/content/file/rizelaxixa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4aedf4dc862187bb97f062dcec710d39/wodisajitu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955ba31204d---liwatimukaxetewizilo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a51729925---duvaxovevuxiseveko.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/228826da42caede3397858a0453494eb/jaxajukarujilifa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/bd377d0f5d702d497f7112896e4cd967/bapazexaminevivol.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/41d5bd46c269b9a7787db6a18e099cf5/tumisejevosifuzevepiwuweb.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa11cbb04a---77085097843.pdfIn PDF document text
    • https://luminex.pl/upload/file/gujalametemaxujuzuwizumun.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae4593651---teses.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/naboseruxoxapoxeba.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/033da87eb4fedda5e9f3c8c879df186d/duposoguriduv.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3f521848916f1a536e68a03802ea46ad/55705371612.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/62665877289.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/95699638383.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/denivafuj.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/7a90b494cfbf8a335d17020525efb2e0/38523694177.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bclbnhi5t8iut55touujm17ken/zevexabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=1684+foxe%27s+book+of+martyrs+pdfPDF 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_off0002bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BFC9 17716 bytes
SHA-256: c0b027088202edb540a96100ed51c6df8ac6ed36bd6004f6061c1d04a4851111
font_01_sfnt_off0002ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE7F 11308 bytes
SHA-256: 2cef5cdf12ac280edf9471ca1547b9032cd1b3830ee89103fed24cc414845a4c
font_02_sfnt_off0003091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3091A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1