Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0653e423df910bf…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 19:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d098e441da4f8c72ad186ed520be3b56 SHA-1: a25ca8a62f58ec1462320e45ce0a440b0a88956d SHA-256: f0653e423df910bfc3bcbff85b39f69a239804333878e6301f7fe677709fe887
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://khocabien.com/uploads/files/kitireleta.pdf In PDF document text
    • http://pb-book.com/user_file/file/20040238120.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e3e544ed3bb1611acb42c0a0c11991b4/wosogik.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/givuvuninimejozagigop.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zozutajelotowamofaweziw.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/kiketosutiduluge.pdfIn PDF document text
    • https://coil.hk/upload/files/gomixupenokiti.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/44920158860.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/sutulixugudat.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/gapew.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/32041541963.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a412a7dd357---nemugoxev.pdfIn PDF document text
    • http://sdes.in/uploads/lubederodaxepovobulumibot.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/99829449866.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/91442240271.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/relubem.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/91177441887.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747545845ac---kavote.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gozakeluziji.pdfIn PDF document text
    • https://kaparatt.com/images/File/67320695337.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/vizesevafefobojuxum.pdfIn PDF document text
    • http://paliukenas.lt/i/File/51025632364.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b548e3c32c6---40244310526.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/57716001100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=echo+cancellation+pdfPDF 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_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10432 bytes
SHA-256: 5a92c58db1bfb3d7eac73fd3187743af4056bd8731cb44bcf3c455e88b77d400
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 18444 bytes
SHA-256: 353d7a34b6108574ce68d7fb1bc194b3fc1f5a7722804a021c3ef8a349be4d8a
font_02_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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