Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0b30d08ddbe8f5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 00:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6c294c7693409da55fc0b639081f01d SHA-1: cf75f3c7dedee13cd7e127e7c878a236e595c2e0 SHA-256: 6e0b30d08ddbe8f533d6d34c549cb0d7218aceaec8bff4885fda967dc651551c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's purpose is to act as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tebra.si/userfiles/file/94933575316.pdf In PDF document text
    • http://aytekinpolatel.com/image/files/sipudevaxe.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/93665135484.pdfIn PDF document text
    • https://vzglavniki.net/data/file/20124754022.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jebirojosobibubexaberej.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/75473882836.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed17d45c4---53068436326.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/vakexarigikiregu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f2ae83bc---najovamo.pdfIn PDF document text
    • http://sooclose.eu/upload/File/71378660804.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/duzekerorubesusivir.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39a9121ee---36519741980.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/werejomozulixulagoxujerep.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/62129861654.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/fotasov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58d5b96b0---suzuvasejusotaj.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/21264754595.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/28299105717.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/fusigimu.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/pukezajavisuba.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/11101274942.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/tufoborebejujukak.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=custom+skin+creator+unlock+premiumPDF 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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 18324 bytes
SHA-256: 804c3d3020930baa07d4202f4f49e75e4f55500ffe5a33870bdbe7248db360b0
font_02_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10756 bytes
SHA-256: 2c30d0d88d9acee544d641a0551b33cddd7c13b408c64122460168036b929319

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