Malicious PDF — malware analysis report

Static analysis result for SHA-256 439b389f1785f26f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a117894362ddd504680d5f2b55a17164 SHA-1: ef39214c8f445cf409f096bfb90be9d74b070326 SHA-256: 439b389f1785f26ff72a391a50d1570ef3ca6c9488961fc588fd95ef8838d8fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly indicate an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c18a8f4b3ac---51205693459.pdf In PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/luvirakonu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexulolobonorinegox.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/posogibadiseterazofuj.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/mojabebikofazitutija.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pakelubov.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f3c5c6a---zejozo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ofg6mmulk792eo43gub0aho7nu/xuvebuzu.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/22080116036.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161185d922a06c---niketeviduna.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/86102926141.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/60268397278.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/bojezoridizireb.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/milomerawizewuw.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/71020792145.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7a9bd393---jexolewakukuxevum.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/zebibipakoxetipib.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gejew.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886efebbd41---nepotovige.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/bupaxef.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd4ea0623---lofujijotumisiloli.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a55af528c1c---tugezefulap.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/63305457981.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fb522510---76274417989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=safety+moment+manual+handlingPDF 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 17756 bytes
SHA-256: e172ebf121a721052fd1137d86e4bcf4bdf06923802656e51bd62e4dd94567ab
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10820 bytes
SHA-256: 332759b8a5a8c57dfd2ecce2a79da9b437b2d07d3aaec030702f2c9d4e8a78c5
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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