Malicious PDF — malware analysis report

Static analysis result for SHA-256 482bd1d00411cd3f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 12:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef798943c2570ba6897a480d21ec5919 SHA-1: b563d2ee9a6fe2bb05a5531fd780fc2f99e67697 SHA-256: 482bd1d00411cd3f1251ecf8047e446f4cd2729b47a9a69acb338a8e349db44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm suggests it may leverage embedded JavaScript or other mechanisms to facilitate redirection.

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 http://longchimvac.net/app/webroot/uploads/files/dulazore.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16d4ba5e51492c897405776e71180cd2/fagedaboxuziwowoxagulax.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/43005394152.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/5250191834.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/14dd2b5e666128a3e36c04c071034e53/66475366805.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/zilerokekam.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/30082086669.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/fatibomosojunuf.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fukopinazow.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b227302e393---jelutuxunudogonekufel.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f5f49b44bcbdc9f4db3e4ce625eb4f86/senabopewofo.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/90988972987.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/d81g693j5jd2cq9dg0d2oob4n6/bipoludenikaxesoven.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9cac217a1---firibamojokuvagifulakegen.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d157f5a0a0ca13e00f31ea21225f844d/foligakuzevotijobipil.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/3232009439.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/fituredepekasonesagasoma.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jevunit.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d13d1236---dufavazububisoboduzijur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/sanokasakoxajujuwalobed.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45863a3d9b---13880516773.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1rse9ol23bntvuragl45kqlkd9/mozufexaniberizekidigenum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dbms+queries+interview+questions+and+answers+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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 11152 bytes
SHA-256: d4e24eff0cc3d2ecf520388d926866a04ddefb898c7743fe7f74809c19d7f201
font_01_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 17656 bytes
SHA-256: 8bfe3c8a683ffe40636e80cb79d0e94a5585e9e8944f65034e153db9d9329632
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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