Malicious PDF — malware analysis report

Static analysis result for SHA-256 828fdc8cd4bcba91…

MALICIOUS

PDF

95.9 KB Created: 2021-06-12 07:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be576264e7e0f80bc7c4fd735b045b3 SHA-1: 4dc1851cc9d6ddee0f73454bf144c6fd2bf580af SHA-256: 828fdc8cd4bcba9178cff7ed36521dd6cf8b425405cb0f81bdf147dc1aa2bbea
156 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://pixomot.ru/uplcv?utm_term=where+are+the+next+summer+olympics+going+to+be+held
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/cor5rg422h52l2ci6plc340glp/lopilojabedana.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1e9062d8---jefenifijop.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b78656536c0---24350206102.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uoushegu42807a7t3c0f77d4u1/bolifugun.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca4486f3b---55644526764.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c589a4a6d71dc93943342ce8c243c29/pezivukuwe.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac5c16ddd---16572851880.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089504282b63---telegofan.pdf
    • http://dush-kz.ru/uploads/fck/file/94905828044.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607985332d69a---gumaraser.pdf
    • http://zonazero.es/userfiles/file/45181862791.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b50bcbccff---manavu.pdf
    • http://verynailscm.com/user_img/file/73415698589.pdf
    • http://aa-nusd.jp/solatunigibimenexafizoneg.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e97234de3981393120a29439aa3b2033/88354970050.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/466c023ab6ebf138ca967570dd909ea9/namesegapogafumubolol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dfa.bin
2eb9868dd2b8ed6652331fa2101c48040573b119be891fc8b343d67a0007322c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 5808 bytes
font_01_sfnt_off000131a9.bin
fcd30b8873f97613fed703fb177f42d9017a33bfce9291a38290f973a57fb28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 12132 bytes
font_02_sfnt_off00015abb.bin
95aad42a4e6030f8d3446f17818a556aec52e8bd4baffa6161fae9bc4bbb4a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABB 16256 bytes

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