Malicious PDF — malware analysis report

Static analysis result for SHA-256 1310b5221c2c6d0a…

MALICIOUS

PDF

102.4 KB Created: 2021-08-11 20:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f0b6531abfb4c983a78d4d3b434b232 SHA-1: 1a3834fb87001e3d3c38a5cb5ea389460e4a921e SHA-256: 1310b5221c2c6d0a9c0667e4c90a920ad11dd4c4a2a4a7b5ba6e893c6acae57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV also detecting it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=formato+de+curriculum+en+word+para+descargar+gratis PDF link annotation
    • http://anthonyvienna.com/sites/default/files/file/lanomekamube.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/54189678511.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae283e1cbf---zalar.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/nawobutufo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6b141a01---7183442236.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fuvefufaniki.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ih8qkct804qj61r0m49v9r0lt3/91986495338.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/17580449104.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/73451475302.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j0ha863flheki65sjlppo0q7gs/rirof.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/juvesovinela.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/4211985241.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pakosixoritebunapedenav.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/nejedumeli.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81331207206.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/84017342364.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/8584535616.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/37779413188.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3347442ec613bda8f097f41d21747919/fumukujitaxepesafir.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e1ca39b01---delagomax.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/76206259959.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EE 11020 bytes
SHA-256: 282df7428ab4686c2fcd9adc5190476da0a35fcb678de4c720b849114b5018c1
font_03_sfnt_off00015c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C57 17792 bytes
SHA-256: f02d9fde98a4ff0a1ad43ce18582447e3ac35161a541dc0c12a9ce21bf801d34

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