Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a1bdd52302436d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 12:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4db956643d5623824e789bc2a70d94d SHA-1: 4db3c609f567ac5e45b84ec34041e13259564098 SHA-256: 79a1bdd52302436dadcdb6d6bd1c5f46ebe179e1439b672ae6c77f4c249b7a4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong likelihood of phishing or malware distribution through these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=manual+journal+entries+table+in+sap PDF link annotation
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f5b5d163af9524a162664301c5eaa88e/18328782989.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106222202167765.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/kovogidi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/823dc4650dfa7ce7edf4aa301706a8de/93543414440.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/lifus.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a3cc91b29dbb1564e4141d24e4f25b41/30329048676.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d25ebb64---75557567314.pdfIn PDF document text
    • http://hangquangauto.com/files/92910136579.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fbdd12244---82088480385.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/54120831186.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/buzowadilawimebi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611c291c6852e---93695752640.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/afd63e8837ff94a3dcaedde65b1a87bc/73128216149.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/55838461407.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/48936199486.pdfIn PDF document text
    • https://argumentua.com/i/file/kivesirelilip.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dd7ca66f---10786439614.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/bomudutalalu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/59976af72add0ed5b31ee0d2a8ee0234/25124990020.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b09e27e1e---mubakanovu.pdfIn 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://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_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 10608 bytes
SHA-256: 2532551233c7ae9489027df2ad9a8e479c0daceb30ba8eff814efeca11be2d99
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16708 bytes
SHA-256: fb61e72b3aed42150954f512505c7729e7a0456ac9839c02dc91c02925dfce27

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