Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c484c895c8fabd6…

MALICIOUS

PDF

83.1 KB Created: 2021-06-09 16:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 965ff2fc67e170808e5ffc273d673125 SHA-1: ca8a619a0d4cfad943711cbb818b0306f201cab8 SHA-256: 0c484c895c8fabd633d6cd0c86c1a64f52bb2b7eb9a2a836601650e54c3186bc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=kannada+epaper+pdf+free+download PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b9e27d5d24b6ddb75be7fc27c9a8fcf/runigeborikegegewela.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/balova.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/msi74cbvtkt7ulpc1rdj70n2fm/46938827896.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/51131685585.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27228676069.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tajoxajezituxeruwi.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/polug.pdfIn PDF document text
    • http://faradbox.pl/files/file/tafasujujowe.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c75df07d1---tomexifew.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e050990c8463e3a1d989751a58ae8213/tadufotewekisopenu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cj317lnhck7j6qb0omlh8kaam5/24695197224.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/35005655004.pdfIn PDF document text
    • http://azizolace.cz/images/file/40541625609.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file/%5C/larewo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c7a20f12---xomadeton.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cpo52e9sqmmr3e2hqbb9del0dc/77385225220.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/19228393768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 4576 bytes
SHA-256: 4b058cdd13180deba8170b287ebc97255709d6e141dd105e851bb0cb7f98c982
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10588 bytes
SHA-256: ef67acb3ab70965f9f8a15aaf13f07f25f60ae501c2c06bd36bb906a2ed91f53
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 5768 bytes
SHA-256: 7241c5c6b0256b43e14f32ae064a98cfd9d2fa5e5991fffc8674c84f73a477b2