Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef08f8cbf38f88a0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0a858f6f9e2b26a52dd19151c13da41 SHA-1: 8e59a3053ca8a318fd3a68ead40e8caf73760e14 SHA-256: ef08f8cbf38f88a089e667b45d0086511b3c9fafea23f516e68f01f9ebab8581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=trigonometry+questions+and+answers+pdf+grade+10 PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bibewixofososuneril.pdfIn PDF document text
    • http://cx-gl.hu/images/files/48843944542.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/vasejikakijosiw.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/35339946477.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/2960748282.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/89852164.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/57329720406.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722f9e11f9---motuxiwakenametumilujoxa.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/sikaniralarafisevuzobuli.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51569218616.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/bubizatijidub.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d2360633aab---masidogafadozakexazizurut.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/42436947757.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc17e72cba---doluxirerukuxo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608019335f0a1---rofigoxiz.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/xopedavozetoduz.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12794c232b---21826203187.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1901912806a8a6b381f1ce0099b9082a/9184403712.pdfIn PDF document text
    • https://mahae.hu/files/files/13814880368.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/polafoliloxi.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/60832045726.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/wevokuwoposovow.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74642471570.pdfIn PDF document text
    • 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 11380 bytes
SHA-256: c89c2a73fa9707e3d9251e2039012b56107ef9988dad90d97669f3e267bb38df
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 18296 bytes
SHA-256: c2761bf8d7b3ca8953e6ac918aaf90c8d48b4a411080b9aa876678f1aa4b1768

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