Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c29b65bddb7ace8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 06:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 545f2e9dfc5157f05fde8b35fcebf7bb SHA-1: 9e3f23895d0ab904398ab96cea044b76da5b8941 SHA-256: 8c29b65bddb7ace86ec36fe3ee7c691c5c640ec67c57b122e300f3fd3c4a56a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vivaldiroberto.com/img/files/mediafiles/file/56082630324.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ch0vesrnslfolo0qe1ak2jjs00/81644206620.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/19794786424.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/siluvipojozozezoviraj.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/zuxidisesuditikib.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/57666018992.pdfIn PDF document text
    • http://zaiger.ru/img/file/xalilojatipimirav.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/38411383346.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/439676075.pdfIn PDF document text
    • http://zerosquareonline.com/file/95291999696.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f1f20ea3---69149214253.pdfIn PDF document text
    • https://phunhai.net/upload/files/vimaguxujewededilaz.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/72491384356.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/42314168707.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/68008925873.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/xudazaxejaniv.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/47970243511.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121625139299.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/seregewuwifajolupesedaj.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/18374656288.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/wemidujulel.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/lorigofegekipax.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/713f868f88f925b773fc9a69cb5ee8ef/tinodiwodajevofanidota.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/penawutiw.pdfIn PDF document text
    • https://hse.tw/upload/file/7122986504.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/8780657447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=art+of+war+3+apk+modPDF 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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 10448 bytes
SHA-256: 5b72607aeecfc30a964ee62fa2b201c1eb53fd44c7e3015a41b054baadf44738
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 18896 bytes
SHA-256: f457ae82f7abcf0a32f6a9ef3bc6d91a6666cc268f0ae2349934ecd073b74293
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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