Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca8f26fb43115f7…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 12:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a641d53364098b6eb794ba230560ac9 SHA-1: 9b03e54e80970b4874faa628fad0bbc90206b650 SHA-256: 0ca8f26fb43115f7ab9549679875ea27099e77473acb2ca3753bad14643dcd64
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a link farm strategy to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://vydavatelstvoklett.sk/userfiles/file/pogulelirakak.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/26500768843.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/202694498.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8ceccba90---bomuzumulonunadila.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/58016747069.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/dawevopimetofifariver.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/10694524927.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/kikofisimudepexekoxukira.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089dff8111cf---40656233064.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/69078980599.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37f5fb827a---repakedori.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c974867b24---94174594489.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160964f81b0abe---12509055717.pdfIn PDF document text
    • https://phnews.ro/files/file/64388813750.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/7146830766.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/82907410201.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/natebikovataj.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160772c20d9091---kabelevugaripopekelo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/86495095576.pdfIn PDF document text
    • http://okun.su/upload/file/zigujabevopofuwen.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/25052154565.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4dd9c60d7---12681097039.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/pikuboron.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abd074a6c---63685577021.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815e8c2b1e7---vojajasowa.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48462038776.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9449d4883a0f57889b7f58057dae0bf5/86323067273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=types+of+glassware+pdfPDF 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_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 17308 bytes
SHA-256: 3a0273ce894e42802134972c0e547149f9ae1b6005d0c8845f26e94dfcf61f04
font_01_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001417b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417B 10540 bytes
SHA-256: 387eb303107d2b063b318935fe5e493671da1017c012cc2d5b2f85ed94b3c61a

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