Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec22db03732fba38…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 10:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab4871a776f7a1bfbe9ba5dd36ff334d SHA-1: 13a5f7cbb7d7107207fad81999c581164d9a6d3a SHA-256: ec22db03732fba38251721e75ab80247e5dd1be4a19b5bca939d4065c35d1005
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites, which is a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac5c91344---levaxujusofelekifojelij.pdf In PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8767c2b12---24980875871.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0374a2bb3ba360fb65535b231dd8b877/2728818216.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/td0qhcg87jm1q7due33vg54ko5/pidanugegoxekefevam.pdfIn PDF document text
    • http://unsersohn.ch/images/file/24656540281.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dodipipezumijozemibome.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/miforodarebotitazusepaxis.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/68854509301.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/22754254793.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf373a695---repex.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/didosa.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/sefesewoxebuji.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/11015609331.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210617_5CD79A00B5AAFB2E.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/4989290641.pdfIn PDF document text
    • http://hak-al.com/resimler/files/86838624308.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/015bb78f6a7d6aa7284f873853915dc8/najixunimu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tajalolur.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490523d73b---wodamidesesejobomexo.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/damofokedigu.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/87170459652.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ea0c0d7c0---13741584272.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/8609794541.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/werugopenunimisum.pdfIn PDF document text
    • http://ubest.ru/images/file/37905199278.pdfIn PDF document text
    • http://anpo.vn/upload/files/87637578352.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/92967531925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=defensa+personal+militar+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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10660 bytes
SHA-256: 301327c9c4c6806ca5e48f665f5d3ef20802e0eaff9e93c84ea7f65edb844ac2
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 18624 bytes
SHA-256: 952a5482713e85d6c062508bf82249d80c9d44147bbbeebf93c90501cd5bc839