Malicious PDF — malware analysis report

Static analysis result for SHA-256 a554a11609a2a1a0…

MALICIOUS

PDF

92.9 KB Created: 2021-08-30 21:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b086d26210270fa1434ff997448446f SHA-1: 51dd40c72cfe31366093012b4508f86e89af5afb SHA-256: a554a11609a2a1a04e28e9c5c7ec9fea6412337105811dfb8c73c5f3def97794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://hiroshima-teishaku.com/userfiles/file/mamobomogibizedotewabojiv.pdf In PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/edc0375aee3776774db21f1bf508499f/31062719540.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/61599091956.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/75208344914.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c0cda765154e81391e6a60291c3b6e73/levugizesijixo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a92a0c5be955be19af358500f385737f/53628571676.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/utvbdade221t5scbjt59rsvcr3/88167835117.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/90693869546.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/motugamokiz.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/zewodusuw.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/8552393607.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94978128010.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/6147872944.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e6f22d60---luniveluzuwev.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a5aba43ab2a2fafa4d6dd587d0686392/56712245298.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regakizeliwifomomi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/75588363978.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858e64e35d---27809812228.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/sajaxizuzezowivikamorofi.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sokosikub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+haunting+of+hill+house+feminismPDF 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_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10624 bytes
SHA-256: cd216abd01ef05d04bece9ccf942c07c0705ab4138f110c08064609b78d1e09b
font_01_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 19176 bytes
SHA-256: e973a6e5e00a007471fe416f23dfb4c0ddc210f1b42704b147ebcd17758da8e3

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