Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1f6ee00d6cfd2c…

MALICIOUS

PDF

96.9 KB Created: 2021-09-03 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21a1b8c6a8fa74d6b71c3eb2f143a373 SHA-1: 0695dfb273da349f49ad4cb1ed6a7e9ecaef4c56 SHA-256: bd1f6ee00d6cfd2c0d72605190a859556c47f4bbe510e2325edc3ef59c3e7b4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9977

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/745dc013e92cc812262f7f96cb3f95bc/dodozisakovalawiwuxitaz.pdf In PDF document text
    • https://razredna-nastava.net/files/53583478768.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9f82b4e4eeabe8384c8e34040a97eb06/lelajo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/99550326179.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/23371679489.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/12440385862.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/mudiginasomosobat.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4hohr968l7sq7vs6v74hnt8o5/tagutolonikal.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/todudisigawe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e3723126c---lefiwelovuzewe.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/vozumegozubipuz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b92920e---56573105952.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/1351730591.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c6b2ab936808c4955f61c67dbcdb25c3/musefurom.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/mosupu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/69623483e76df776944394c2a0f8604a/86635150771.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd30b6f2d1---11446710271.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11383640110.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e589aeae86125acc3e3c40a1797c3f90/50013783084.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/nagodakibekujo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e2ed1484---1194998052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=electric+field+and+potential+all+formula+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/16bc34fd835db2d3063ea43976d50e72/51980559249.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_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 10696 bytes
SHA-256: 1e0df93cc785173e8e795d5667d72f9be06c27ef5827d38d89c70741b9299537
font_01_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 19056 bytes
SHA-256: ff8cfdcce8c8754164a0ed546631bc08a78680dac57147b687b9e1f6ac62b385
font_02_sfnt_off00015d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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