Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5de5d8b33324b1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 11:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a769ed23080ea8acefec4a4665c45a10 SHA-1: 7177d195a3137418b0b591d83a9bf9ad5363d399 SHA-256: 9d5de5d8b33324b163358835c8f1f0ba2bb9499d7fed6fb4d6b077c37616400c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The file's structure and URL distribution align with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/16670d4eafdcb0d9ca9dd77cf6840d68/xufobomozojogesaxiva.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6b7677e1c14461589fb38e0a787c109/pivekarufisewi.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kovaxoxosulavikirifoti.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/51695733053.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/gupepuzasewovodigapotane.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb398006a49---65884587368.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078630ae3aca---tolefikuvifidabuwulapudi.pdfIn PDF document text
    • https://geniodelweb.com/file/50206090243.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/39168389479.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb96953d69b---navekuzepapepiwaxawiwunem.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/23271140904.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/56037924006.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35531043636.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b986cc529f---vimewavovi.pdfIn PDF document text
    • http://vititanon.com/user_img/files/tufedemopodu.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/wutetetizinutogonifeko.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/80194939924.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/loboz.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ed0d79fa95101e2ec0451014b9ca1340/89797621946.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/55938067945.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6a02a741---zadawumexewevulokazovoju.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021080621553673499.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088573259b3f---65170371835.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/95517403102.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/62068470900.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6ec26683---momapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=central+administrative+tribunal+act+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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 17732 bytes
SHA-256: 94e1961d64b60ac4526b6ecc7eba57441d62f39b998a04a99a6cb12228bc6e91
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10996 bytes
SHA-256: 5c4a133aa126baefadd773ef194722c92d5422e0b895c50148af62578bee7720
font_02_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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