Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50dfa4fd521ea24…

MALICIOUS

PDF

83.2 KB Created: 2021-07-04 14:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 974b170cbab18b9d00be7b293c79ae59 SHA-1: 9e65365baa0e1c70792a8926d86b079eda801be3 SHA-256: e50dfa4fd521ea248cd1bbe20df22d359ddc597642eac97d45715a253a8b0795
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=topic+4+physical+behavior+of+matter PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e998b5a4f---56284766562.pdfIn PDF document text
    • http://bjjiffy.com/upload/92403086306.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1492555e96d2a67fc607a0ea54a1d98f/tavutopasij.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/35710883923.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/30471257699.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mj2ou45qvora16q6q19la7u75d/dojok.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ba9c14441b7f2c8e6da0d33ee1df5b28/pozubo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30a577f70---pureruzemelewe.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nezokuzefulujimej.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f0d5910a63dad2d69167a4f1a29606ba/sojiten.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d68b51f6f---70486636401.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5cadfe2d---25956699421.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fuvutixigemabo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e92c0c6bf90c67292434b4ee972bff5c/golusululibakatuvipasa.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/22444968451.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/86497883920.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/3147737177.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/80361410074.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9d680d27---pizejub.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pifidadawaxog.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/86086136ea388ac8f18d4017943216d1/tujawiwuvaxilunuvakujem.pdfIn PDF document text
    • http://sakem.org/userfiles/files/79927117248.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_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 17544 bytes
SHA-256: 421a37d99c11c4f506694d20e5165954985a0c3adfaf7621e3348dc7dbe72b0d
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 11004 bytes
SHA-256: 47afcdd48ed2f56659678d27e9bd3c1437e318a54246093a94c7a072a1805147
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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