Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea62e3796b404f…

MALICIOUS

PDF

78.5 KB Created: 2021-08-29 13:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e94357d2b1f2b9c5ba8441e1e1c87b3 SHA-1: de7aee37a3daae7fe56d92060698a4ecaf9540e1 SHA-256: 9eea62e3796b404f01b8ca29143affed4b8d84f8b3d71f151fccb22a346d49af
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to manipulate search results or redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://muzeumkonstancina.pl/attachments/file/44438654515.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/k243eu3urednetc0a9b2qir6e6/tosuvutobobaxepawamed.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075150c08365---93995034645.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210620_79E9FCB8E8F39A4E.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/55756867982.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/369ead5b574816033ede21ac74e53363/90795370612.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b82920dcd---rovikina.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f596abf0d---40844380931.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1502031513---tizit.pdfIn PDF document text
    • http://umhouses.com/uploads/files/65325925024.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/58933994068.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/magupuxasov.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/26785690418.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/76713788416.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895ef0e1405---pavisiwuzufejag.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87589880e9---fexabevofonobivozitadiloj.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zukexero.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/mukitujoroguvoweboluf.pdfIn PDF document text
    • https://ms2oke.com/contents/files/62780510755.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3b722441ad98cc76c39fb33ec6ead5e7/bekabivig.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56d850bed---42266548731.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/45731429638.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b7442eb1---wasujaritazekexoberudo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fd93ad058e9663e333d2d643d4b75ad0/zelavagepevozuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+an+authorized+copy+of+a+birth+certificatePDF 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 17096 bytes
SHA-256: 9d1e2d53521a2f835f55e49422e14448f60ca4855bce13cfa4302e05b08c50f9
font_01_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 11080 bytes
SHA-256: 5b1175ccff43cf3b186b4d963c9c4227d8ce721780acc681ff63b4cb0f6a89c8

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