Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be3dcc4f9a8d385…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 20:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84befc7a4a3dc86d4b31e041059ed7d8 SHA-1: c46f15352b7956dcae37d41ed97bd59f4f75316a SHA-256: 5be3dcc4f9a8d385d6d3d14e519f974748880bfa5245afa0e0191a7025d5df33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document is identified as malicious by ClamAV and a machine learning classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's primary purpose is to trick users into installing a malicious browser extension or update. While no scripts were directly extracted, the document contains numerous links to potentially compromised or disposable hosting sites, suggesting it acts as a dropper or redirects to malicious content. The presence of external URIs and link farms further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rsst77.ru/upload/files/84026607315.pdf In PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/19471147155.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130d286e80d4---96387439167.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc0ccb6fa---41747530726.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/motadixokinesiruke.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/jufazes.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210912_165722_2014.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///wolotisijarijutoweg.pdfIn PDF document text
    • https://magerp.org/upload/files/70594263514.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614233989ebf4---tunususodigamurofu.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/8122661546.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6614fcb9---naketusof.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/92386528527.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a2ab3bd---gaketadajasumabumomod.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/visadipifozukasakos.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/20276695735.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912012507_d84i75.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/57437641355.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/36253935103.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/86670085053.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/85734712271.pdfIn PDF document text
    • https://bdata.vn/upload/files/97819560531.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/69871973835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wallpaper+windows+for+androidPDF 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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 14856 bytes
SHA-256: b9a08329a685a7b46a94b9048c09ecd54a18879921bbc3bc49bc0a6974d7d7b4
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10472 bytes
SHA-256: 0a4ed335b6ceabd84daf2f2fed7cf589ccaf4464548578a0f178f2774eca6c18

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