Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cc2b2a3d1cfdc0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 19:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4473da817e73dbb29f6ef565ccaeffe1 SHA-1: 6ec0af34d3ed9b3b6266781d7b105dccc4e20243 SHA-256: b9cc2b2a3d1cfdc00e1c5d3c0e1dd2c75fe96014ef63bf025392b5d3fca166e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=nclex+pn+saunders+pdf PDF link annotation
    • http://appletechsolutions.com/userfiles/file/jatuzazebezakojunabowo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/le6n36pjl0es9pkl02qlcpc8h8/xefepimajix.pdfIn PDF document text
    • http://candientuvibra.com/images/file/febisowutisoluvukad.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15b387ab9---87738196674.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nasusilelupegobu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/3350496220.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/sowusevexid.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/72577287724.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfd7a4e5e---kalijoginaxozonagafoj.pdfIn PDF document text
    • http://firegallery.ru/img/upload/posilizazoguxu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/91923905483.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kexujomimilusupifu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/laxapidoxixaxifikosoled.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7ef6bc8d---59285159521.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/vewiraraxaji.pdfIn PDF document text
    • http://carszana.com/image/upload/File/28767963138.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f7cf20d58---85896500407.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/puvegafenewazanonevuziraf.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087d659d0475---newowisebuw.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/30631693226.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984e42e8268---kelegemifivuzunosabewakub.pdfIn PDF document text
    • https://viettrungson.com/media//Files/49590696175.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/rexilojozepowudemu.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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10480 bytes
SHA-256: 1bfaac7dc161d7aa5cec5570a066b06eb3fd498dce9707ebf3f760c04af25595
font_02_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 18516 bytes
SHA-256: 37cb0c8b78e4e5763375aec70adb4b5f1e67939aff1260c12942536547042054

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