Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59152d994a6d81c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 18:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3878b3304a46b31ba02b10fc9ec0f796 SHA-1: 0881e1c0e4f3ee5342dc14fe3fb38a61a18c8c95 SHA-256: d59152d994a6d81cf5bbcf057485afa072729bececbf7aa964f5bf6f8e379237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2228b07002b80848bd61a5eaffe9b16e/dufurusakebakunujivel.pdf In PDF document text
    • http://bluebiz.kr/userData/board/file/jejesi.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/63752948269.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/pasaxa.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/fozajoniduzejazisogiw.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/06b4bbc2089944a3a01c7cd3ceb39ac8/8855318224.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wekulerer.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/nalura.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bcc303971---lowipanalojevosazekol.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/dulisiragata.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pavalapiwelaluzum.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/40457727573.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa548f1e44---vunotefizaku.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/86805901734.pdfIn PDF document text
    • http://ombs.ru/uploads/files/5413574446.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/xedezevitivepawojufevi.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/xifupebovujutiro.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/femanoratunajosotifitod.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/12687602684.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xirojidufugulogexev.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/19617887504.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/16921767043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+vlc+apk+gratuitPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/88583365722.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 18984 bytes
SHA-256: 459eead7abd61231bf928115bbe98ac5d985ac399061ef0006e383e54511b194
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10484 bytes
SHA-256: 4c11c9c4be8c9748619cf089e336a671cc807ee37917bd827196170cc4d6c316

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