Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72fd5c4add097fd…

MALICIOUS

PDF

92.0 KB Created: 2021-07-24 07:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee867cf8f6834f157c077af9b0fe92c3 SHA-1: 73a9683a84be781424be02f30e8d1cd53a2fcbb8 SHA-256: c72fd5c4add097fde909932961ada14fea29f99cb2b611c339497ae629748e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://greatnice.club/updatefiles/file/26140735436.pdf In PDF document text
    • http://rehahomecare.com/upload/editor/files/xujiku.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160957d0014b37---2938077442.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/saxaje.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/16163520090.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56a7ece04---97076632186.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/krhkvfib4trg4g7nb471p4vl3l/10540834683.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/13211213174.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ba6a3c03b3b2e7345020ec4aa4617b5b/kawawix.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/37467832201.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vugonetitadizopepexopa.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a2486e1a5---64449707261.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210719_6E8D08C90A7A1BAC.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f1khao0gko9gbe5l10k3luhqvp/boxok.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6ae9c4d7---jubawoxamevatokunowek.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/papepevesusa.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/xozosetakijotijo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jbnpqf8pmkcq0iljf4q1qaa361/13129139773.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a465266d1c1---jofutokadazitaligijig.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b7c4ea35bed5571dd6b4461a5b8c4e8a/kejipipekoxuso.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b05b323f0---zavise.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/88127986302.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kijidozisemiwutoka.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bf7980ca---giwonemekejufadedisiban.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/femetek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=body+fat+scale+safe+for+pregnancyPDF 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_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10868 bytes
SHA-256: 4321c907c61eb2edefa72e7f684bceedf062838c59dae8ac24677f1e44b999a0
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 17780 bytes
SHA-256: ffdc94a53114f5a9bb2d997ab8f189cc022dd9a2b7d028df01d6dc4c08b25a67
font_02_sfnt_off000148df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1