Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad323fbe5250fa96…

MALICIOUS

PDF

218.9 KB Created: 2021-06-18 23:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4d1a267a7af6fe5c6b07ecabbb8aba55 SHA-1: ba87f25656991f40dc45c90b2b235299acbf624c SHA-256: ad323fbe5250fa960b044ee2bfbdf0240553c06ad8d8fd086471a8664d74de32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of link farms strongly suggests a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/104eab167a3870160562781f5cd48e16/88282680961.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39c072d2c905ba12b893d37587013ddf/55963500686.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c38567751973ac45f94ce3409e61b4b3/14599943416.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/41927294463.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6709de71---woguwiwetoju.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c071236f70d9dd16de746c37cdc2759f/74313395676.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08352da53---55647367765.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a122aa11f66---66859435029.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/44299706135.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ngvrsbsdu1csn0hhinkq1vp726/mivesis.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5a2b13de2f90dad435de24f4b77e03ba/jodonelenokuv.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/dolidaxagelef.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/k165sf2uaf32dqnob90e8617p7/tavulibimuzis.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file/%5C/tonosepafivitidi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00510c107---xarixomalerefuziruxorudor.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c32269e149b---61116202549.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2ad18c53---fosowaza.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/id559lo2vv7hk33cmfr10mg4al/99592945220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=vocabulary+words+pdf+with+meaningPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000323fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323FB 5868 bytes
SHA-256: da82de36bb0ce27b84bc85dcac322b937fb56f80215bea0707889f1e6f2e6b8b
font_01_sfnt_off000337e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x337E2 11380 bytes
SHA-256: bd43bb627b2a6503708ec9bf1a364af5779b8e7eca14b1b70a7880edc1c6d76a