Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97405fb388b0247…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 06:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 726e0eff78038be3b7b97f9294f904cd SHA-1: 90f8e75873dd065767c336940ca1558c52987d81 SHA-256: c97405fb388b0247d8e81e47a1ef6c97debc596ca585fb80275961664386ff4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=butternut+squash+and+apple+gratin
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb42d66bc3---powovotavamuraveri.pdf
    • http://allprintusa.com/admin/images/file/taxubotafik.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5d71d52281a1ccbb2e3370d48e9a6cf8/bonipabazoli.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfe75ab3f52e7d6d95d6a6c5445f5709/kosofibuzituvogila.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb2a942e6---84018270053.pdf
    • http://0-50.ru/userfiles/file/16921892624.pdf
    • http://findmecakes.com/userfiles/files/90572035706.pdf
    • http://denki-shonan.com/uploadsfile/53905573301.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890b9967b60---61577260081.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4v50jm4k1n6mls50mqmgk133jn/97685229641.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875fa937ee---36411423639.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9134bf8b---saluwapujak.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nupekagorutepedotodiwuf.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca762c26f---39196158484.pdf
    • https://chief-moving.com/editor_upload/file/48501115389.pdf
    • http://movietek.vn/hinh-anh/files/10513312832.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/d72bf1c32207866e94401685d6810782/13132783454.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b4127eb7c96d9021563a8eee270e8a90/47687703286.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/da7451775ec5ef259f717d2c4eac510a/3372756090.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebac.bin
c07fedf7dff1d5c3f0d9f8aafd66566c5aa6b706bb3ab4dadb00ff6dc2372c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 17272 bytes
font_01_sfnt_off000118a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16792 bytes
font_02_sfnt_off000130ba.bin
675852f6cc81cc074035dec963b7f45e01844152941ad7e832681a72f82daa87
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 10848 bytes