Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4c22423a82ca18…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 18:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34a9fb89d319c528f99da44bc31a30ac SHA-1: decf53c0e35c87d4dac502bea3ee7896bddca129 SHA-256: 9e4c22423a82ca1877fcd355532bf59d9e70fb18ac65c8252cb9e651ba3124b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The PDF itself contains obfuscated content, but the primary attack vector appears to be directing users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09cc3ce3d8---bavigiteroxofesasafojik.pdf In PDF document text
    • https://airflow-skateboards.com/userfiles/files/63876384847.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/af335268cdbd7503bfa5a450616921d1/nujupe.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fawavifudetuzebuxujar.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d9d05d189098e56fc016a8c90ebf6331/90914326757.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fb6a8db3e4f1ecbf00918d8dd80ad8e0/tafusejogexi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/beloz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3knrlhmufs6tnh8cpf8j2fe46c/tumobepawu.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/nuxofavowelorixidawepumij.pdfIn PDF document text
    • http://poiskvod.ru/images/file/2609301716.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161038cba14382---8130076135.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ff17eeee192fa1ab0909aed7f4d63ff0/tumine.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/47645647261.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8f0677adcdea08e1032392f3539afdb7/namadesirafuse.pdfIn PDF document text
    • http://stevis.cz/files/file/98270765253.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210816_001402.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8be62b02c5bf35954cbc22f94e4a35fa/82738176264.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9740dffb---49739566005.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kaxadutulawun.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9c0c6951hcapb361dlsujpmqi2/32479781739.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jixezanixuta.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/52289221632.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/lupawoxitafidewadub.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff920101a8---karifeduwulimi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/duxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=expediente+clinico+dental+pdfPDF 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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 19544 bytes
SHA-256: e6fac95e7ac2fde1bd45997a90b0f75a7e4451b6c304a789f251bc83bfda79ba
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10428 bytes
SHA-256: d4877a5dd41a0d6da92c7c0102ed937cbf7f8526aca6aa5e453364a5a5cfcf7f

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