Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829aeee1137fff8…

MALICIOUS

PDF

83.6 KB Created: 2021-07-02 18:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f664d0b588a898703e3076aa4f141fc6 SHA-1: 84cf5ba8c62b76e334acc08b266441b6491177d5 SHA-256: e829aeee1137fff83f6016f8423da4034aa0d2612a24f019ae15baca0b01d20e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fec53f922---pujoborexarelibob.pdf In PDF document text
    • https://micro-churches.net/uploads/file/27140673018.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/begoborilevusinav.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0ruv2fbbv1vqplk0v6a1ntvvem/sexadofajewu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/1237738652.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/16928161736.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vabijikokuleb.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kowopezufa.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/88879801806.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vitepomene.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/73894735e1df77a9e69d419df8f333e1/89854098571.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/wojegog.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/maxuzem.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/t78cjhuk34tvpfd8dpndi8bu02/guzigeku.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755b8186fb---51154385895.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/33769773877.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4dad49e45---gafekoda.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/pitivurixazinirezaxe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/34sgfh0ovkhr12a7nur45krj81/97296018156.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0a8ab4e4---64152138245.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/63815284958.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kiramo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fcd7b334ae16d21314afe467a2389791/63986287244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=political+party+in+a+sentencePDF 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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 10480 bytes
SHA-256: b1c89857f9dbace8342ae9fcedd4071d4f7ae728b624e8041589e5c62cc62805
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 16504 bytes
SHA-256: 614a361fd4a179ad431bb49ab7a8d98080abcf0f8c25d4d20a087591185dd43b

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