Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8de3a4a1171ff2…

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 05:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f27343b4acbaef243c59959f889b13d3 SHA-1: 7ff1d63237fe1a7566da09af891446b54801484a SHA-256: 5f8de3a4a1171ff2d59331901b96b1efd2391b5fd3b2263ce2ccaaa12c7342a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate this PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://lexus-custom.com/js/upload/files/furiretifekomataximu.pdf In PDF document text
    • http://pomocnaukowa.net/Upload/file/27947084905.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/upopitapopelovi.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/dimuxapesu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608215be9494f---bibapep.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb789cae2---91078445194.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/47447799917.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770fcf36e1a---pafimeb.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c231864---fowinib.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161147f5e80853---51890598281.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lisaxiguzupogur.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/949d4ad9a3045e65490d48f9ec9b3a3e/zurufafofemadakevuxajebom.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/33672414299.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/98735121494.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tifoluk.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/69189411573.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/tukitav.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e12667f8c79b8e99bb705a47a9067595/risatoko.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f768561a---6395426070.pdfIn PDF document text
    • http://www.bandungmesin.com/file/3107677058.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160982e629a611---rofubizesekorusam.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/gafijokonasufepidetokivan.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/nujuwutuba.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/49785831943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+chuggington+train+game+mod+apkPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11072 bytes
SHA-256: 6547a7e3a1d42ebb894a0fa7e5118199ebda739d0f84b7eb274c25d78a17e774
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16800 bytes
SHA-256: 7f5bf3b9216f8193b0026c9e0d6237fe2f058769e0e47f5647311503866437ca
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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