Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10acf89b7849d71…

MALICIOUS

PDF

90.5 KB Created: 2021-10-12 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 671766a6c71816d49cce90fdb4c9f370 SHA-1: 11e11387beb227ae3b698fd38643002c32ae63a3 SHA-256: a10acf89b7849d715a328efbd0a74397a128bc09494b0bb7cd511604cf884240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://maidichike.com/upload/files/jirubasulevise.pdf In PDF document text
    • https://mindtrainingsystems.com/userfiles/file/fekosegi.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/34809634502.pdfIn PDF document text
    • https://khanikango.in/file/69484165847.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/napupenazub.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/43283587552.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/rinazazigil.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/towozegabasefivijewudadu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/67428349340.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210921150052.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564307d186c---30831868699.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/84d9107bcbc95932fc93b5c17d104bbb/sufivolobajemonoba.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1615fa5230c27a---6954557673.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/giwulelipijibok.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161418e897ffef---60412275663.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xesumiwigutitaxaxe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/u81osvuecaeb4hn88g6lda13bj/tabutozexezadadosiga.pdfIn PDF document text
    • http://cresapumc.org/files/file/pefukifekobogudef.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/bosuseturenananewuvo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/retexisuritosit.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f76e876225---16154233629.pdfIn PDF document text
    • http://sbkf.org/files/files/45060571097.pdfIn PDF document text
    • http://cl-pub.com/files/files/17434240452.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/88301202967.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/33683561324.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=book+of+the+ancestor+by+mark+lawrencePDF 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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 10992 bytes
SHA-256: 72d793e6e78d6b465d4e148ab574aecaad098ce360f28ee13a7cd45f83acc315
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 19952 bytes
SHA-256: 7c22137d945bb7ed27b93799153e98289c04cf7879bb04f8c31bcbd0177f2cbe

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