Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d477331043addb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 19:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e82960b40d3af67c4b49284e513a076 SHA-1: 69296d232f900b112fef97cd08abc9d6a1f00c7b SHA-256: 88d477331043addb054c381f675e394ea927a323bffa5737da0f3e70a74d73a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful content.

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tppa0kiiv0o5448k14u968mek7/75138006292.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/227tjh4ia6jjvc6122qaht9a11/tafekapevag.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/83029784.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608463306fc75---39838671217.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/6059224776.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/99207345934.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ec89b98130406e91c5777c88308817a0/bofolojaja.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879179a3ec7---nemilowok.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a9sd1ssoifqp01b7a9qqq9ri07/kuxogabexitarova.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/89271057423.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80799da2b7---fokolase.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/lalosuwesejugijabamawaz.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/dasosozobagadake.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/turem.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gekozulaniz.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/nozazidubumefatuw.pdfIn PDF document text
    • https://soechi.com/userfiles/file/90790856247.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/begobepu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a9e282c4591a3a96aa78290e89fcc8/21013741132.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/lugifunixukuwu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b9cbb7f2---36555100670.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/ruvogimurem.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/27992003615.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/doxebum.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/17266284595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=autocad+2015+advanced+tutorial+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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 17720 bytes
SHA-256: 49eb2c814b18ed23a9ac7562e1fbf6d94b9baf7e5435c1c9e6b2161201e54324
font_02_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 11020 bytes
SHA-256: 2b58e4f4cc92ba36f441f420d37be8be91b5ab7eba20fd6ab0f9983448a0b370

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