Malicious PDF — malware analysis report

Static analysis result for SHA-256 53667c272ef2c722…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dd8e1c0d43bb426bfb9c27045cbea6d SHA-1: 4a7d69ea66aa204299d828b0c535a9127b7d4aee SHA-256: 53667c272ef2c722e0c005acd038333e2d17dc1a8f87cb827ecd160d486130aa
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates an attempt to redirect the user to malicious content.

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 https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/768ef4568b94f8d4f258d69ce9c0a551/97879403610.pdf In PDF document text
    • http://csp.hu/editor_up/40883043131.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lasir.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/diputakefumigukikugakel.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5eb8b36ff2b0bb3d7b43fa0188ddc26a/katasukudokeso.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/64947155554.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/66148749290.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fa6f2b4120dcafb19c2941547a869439/21693734799.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/29d01e67235508bf418701de4a0a2349/41092966646.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kudizizazuvuluzaxip.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/80108074217.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/76393643655.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zivaxusi.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/59347717731.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b85ad0c4---savolifez.pdfIn PDF document text
    • https://0900107678.com/upload/file/30163601252.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/55040225116.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52e28d10---38686661997.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/vipedob.pdfIn PDF document text
    • http://canadanur.com/resimler/files/ruderanafexosafevofawuka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b28a580ae---41132612403.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/14286255914.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160cced5e76cce---zagowenad.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f449f7e8---42615237582.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/nanurikujojexow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=merubah+word+ke+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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 17384 bytes
SHA-256: 981c5a1bb50a854b1f91c59eb712c4b12221d50ceb41c6b74c28b651c79b37b4
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 10496 bytes
SHA-256: 7656b0745564529e01952f3c7fe05c360d9ce7fd22ec15ce08cfb88b0c4ec5da