Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e01121e284d9fb…

MALICIOUS

PDF

86.6 KB Created: 2021-08-24 22:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c4779be4aacd01f2bf816622e12117c SHA-1: 8f1277ccc6422e1308291bbe0e66aa1867a8c526 SHA-256: b1e01121e284d9fb7f3e3ca233e47cd6841477209ba9fbfe81cbde12dd8c3fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://plasy.com/uploads/file/fadigugavunowavo.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/sozutapefojamiw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71564b1eb---29820081333.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nepex.pdfIn PDF document text
    • http://arslanemlak.come/file/69777856472.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/suwuwimelapugenavipa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9cdc069c---76512338991.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/jezobopel.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/23326904992.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/88587396062.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/rexawibenamiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fd5vd69nh5gkrrak6lq9ul9aso/retirapovotubaride.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_5ED20FA65AAABA49.pdfIn PDF document text
    • http://santeh.md/img/files/tuwag.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955004ce719---31164243950.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429121830527731.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/liposofami.pdfIn PDF document text
    • http://candientuvibra.com/images/file/83015809897.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/kimunoz.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/68998058966.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ace7c796---xekikija.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfa7d4d0a---wegujolebalujapud.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4f4afae4---lobuvawufuvebodovesa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/86dodfi67m9la3q802hto20t71/vowunapak.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/togub.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/suvipofavabakokiroxogesuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ict+questions+and+answers+pdf+2020PDF 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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 17800 bytes
SHA-256: f3f02389409dd8157e9f019fc72192e98ecb273afce01e51f2158feb0b12f77e
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 11092 bytes
SHA-256: d96270e26552d593909eb68c545a317977ee4cea84fc389b48fcba85379051d3

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