Malicious PDF — malware analysis report

Static analysis result for SHA-256 56078868ea963d21…

MALICIOUS

PDF

94.8 KB Created: 2021-06-30 19:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80b0d819a4fa2bd1e50f3e1d14d7e7c8 SHA-1: b0951abadccb6a0dadff4e8713a1bf8c54040b74 SHA-256: 56078868ea963d2149c59cbd909fa9a9de8e281a1a9b7f808d80b1174552752b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript, which is likely used to download and execute a second-stage payload. The document also leverages a link farm pointing to compromised WordPress sites, suggesting a phishing or social engineering lure to trick users into downloading the malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a67036d3dbaf7422defb57019bc5ad1c/60044363429.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/era8c0ohnc2q0k762maarb584h/36543808071.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/87e14a08b95a08bedcd9cf811c43e12c/34803508247.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf0785fc9---53850469716.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/960db27a2eb4e59a6315b16833597bf9/bovenoburesejosim.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202142964419876.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/81942215821.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/farofaruk.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/28641433960.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/razufakezipit.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/vukibonixizet.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zevoli.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/jilubesizopumutiwolug.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9bc0f01a---36812004209.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608433e79f76d---13101001852.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/gujimitakaxojifosugepu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607709be5aa25---jatazu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe05e8201---70455675180.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/44924990563.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/67833327387.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/57062637287.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870de73d972---tesarifojanuxuzikenit.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6fe8704e4---mabetuwitovinededigo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba2f562ae---sorikumux.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b562b13a085---fawove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=queens+of+the+stone+age+discography+downloadPDF 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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 24512 bytes
SHA-256: 5edcf78b8515ea8705fe03d407f9d12913540596cc3aee2f0423428662a44252
font_01_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15164 11256 bytes
SHA-256: c318f45ddfe590bc86c7078c77c5f9f6a8015ccf2e18e8cb65b9058753ea11e1

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