Malicious PDF — malware analysis report

Static analysis result for SHA-256 59df3af05c3e746d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 07:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6375b68373a130c800714974884e300 SHA-1: 8111fb33f5c6c0e17bb0f40406188c54e9b97a3b SHA-256: 59df3af05c3e746dc95572853f590df3c5ffe408986c9093fda219285cc2bbe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=android+x86+games+crash PDF link annotation
    • http://pascalparrot.com/uploads/assets/file/veraletup.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wegesimijis.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/worexopofonetubat.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/73140288832.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wepazeno.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8b3c743f---retog.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/gajubifawutobegowetu.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/fibukowezipiguxe.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1nnb71fcidc72nuvifoo8i1816/42477091515.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nelob.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/loboletatazinovog.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/newumugepivebovumevipapab.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/93191691727.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210903_074459_134.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/69169737961.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/gimexun.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686063b620---7382521761.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/fujawibomolegek.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/rafunobexalakaganololi.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/leramixabasemib.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/11509518650.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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 11132 bytes
SHA-256: 3c06d7718ad297a1604ded7c285d51cc2d1157d1bebbdac9f45579d94e224a57
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 16960 bytes
SHA-256: 61be7a5c23db8325f88fa14bd70bf97aca568b947e2c6202347cce2acf049e0a
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1