Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b811f009237c15d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 00:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 05754bfc28b2e2d808b08164afeafe54 SHA-1: b0ba417336cc828cd52f7135e37f49c3deb6fac0 SHA-256: 8b811f009237c15d28f506aabc70e4b988038ef065823eda245591fb6665edaf
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The sample contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://prestinoequitacion.com/imagenes/upload/files/sekawunubojopoju.pdf In PDF document text
    • http://orderkai.com/uploads/files/91168542193.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/39003700808.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811f117fd---mepogugodoxid.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303fabdd39---bodowikofu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mjp4iebjhohcrnd696jlsdp7al/63893248603.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0n71f3qdfp50hoht0j429lo7l7/nerazujorekuvefuf.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/161c0a10150b9a8f20b66a7c87e6f64e/57347920697.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/388irh0m5vl0k7kqk3evqo6un6/rilesukepolesup.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/92929454014.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/27446746207.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f3ca0dc8cf305be43955d2c0cd0f8c2b/zavemububop.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28781d23b1---82692391818.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/xijuzaxidodutifu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ac3ce5f994d9cb1f3ee73f9b484aa79/12083497416.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/22260857223.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qr0cqpgao5i8esodmnuu4jvpv8/lijosega.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/mesen.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/veprdmercann318l94vsebubfo/patevirugopuj.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vebamefi.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/58301440502.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/925d154288ef094ca8703b58c9f552ae/91844710642.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/033fbad24e1fa3c2a8020884fb645856/notebazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+notch+fundamentals+b+second+edition+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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 10988 bytes
SHA-256: ae5d8257422914e3d60ed6fc39dad7932a1fb8767cda4f681353e5053b6fa5f9
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 22220 bytes
SHA-256: e206a9fdd7c4126b1fa11ed46c8dd3604cc4e53becafa6ebc2567f7809c40ce7
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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