Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde82a4ec43f845b…

MALICIOUS

PDF

85.2 KB Created: 2021-07-23 00:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df6be5bab92b85f6b223331e8022650b SHA-1: 94f0505756189610dbaeb0dfc09e5ad121cb0839 SHA-256: bde82a4ec43f845b65e893148792bca52d9fd4fc89a2c48f609e5c6e13831a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the links suggests the PDF is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608588ceb2032---wobikosujisuv.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/os7dq8312vd674qef3ap9spnf7/wojovas.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/86121169515.pdfIn PDF document text
    • https://carlojans.com/cms/file/bopuzikebizelemamugod.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0hcv9mpsmr19r5rcidmuc9jgb6/natalosa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jnmq0ac46njmpf8qpfhs9gc38m/jufuxogufekesera.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/36867220299.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/beb43e96c3a83b9598480db39f1aa5b5/repamesifagorakag.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc633522f0---bedenolinolipof.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhlqdf9i8q8bm79bf43gm68397/13653912195.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe9d4175b0---doxozanebifepigasu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/60011231352.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a2eb1d1ef708cfd15eb12c1136769f22/kogelux.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/31288476398.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/39093045534.pdfIn PDF document text
    • http://thegioioto.store/upload/files/korukenol.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///lipesezopowewuluwiz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/96871613974.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/83074466658.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zikuxabodaji.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/ruguxenufi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/033c53bb68359d13997653d301aec0fe/gexetikexaxovojuraxipis.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/35c89fe8662faf9ab2d6bb50f973f2e5/rikumapufekimavafilodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=verb+to+tellPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 17596 bytes
SHA-256: 4b6d21813099ff2a36e271e061824a67b1fecded07d0fb5aafe0d21406a6c3d8
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 9684 bytes
SHA-256: b9c3b75c77673e8075bc8b992338ba32cbdeea2400b5a64a7f3117e382fbd23b
font_03_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_04_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 17272 bytes
SHA-256: bd3371d2ce4449ea25d445897d21204ba07dab95e77682ad3a796531fcc1a514

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