Malicious PDF — malware analysis report

Static analysis result for SHA-256 17df680b70ca4ca8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-14 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f671a73b29b2bf8d104ab37ea1b0f045 SHA-1: 3b2c0e8f6498754b681854099185214198680d89 SHA-256: 17df680b70ca4ca8e61ea16d81525e7cbe7e2f127996ec22860edaf56b3d3dd0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs, many hosted on compromised CMS uploads, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://detskeihriska.eu/ckfinder/userfiles/files/koxabuxenakesuneta.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/fisibotudaxifuxolojetoki.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/6890508490.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/33aa3a2ee8705e3d1b56ef94ea229c2a/87383813023.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/12442402506.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a936cddf---miwomube.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/89d0440ef40747004ca5ff9d6390dc2a/21854791636.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/853b56a7eabaed086e201727b84498fb/27644188540.pdfIn PDF document text
    • http://bdsductri.com/upload/files/48290721701.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22979167577.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68fdd97ff7---87373017477.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0n2d4cf4f38bi59l7r2k2q469n/nosonipupoj.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f6j9kh3e0ql1tj2a6ck9223ekk/zogerexetega.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9460acf01---xoletexekivurepadel.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/64028443978.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/vegajipezas.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/je74jdrrgf4qq35cpcfv3rdd0d/disibiwujifosesiba.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/85528232690.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bulopanine.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0292d3ef5086ffabad28791ead5b51/25672158836.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed89caaa53---57321452023.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/16258118875.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lujiwuzuruwuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+medications+to+avoid+if+allergic+to+penicillinPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 11128 bytes
SHA-256: 79289349291abd468254ea11dab040e371531ed6c657cbe88c03895eb9e2ba7d
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16356 bytes
SHA-256: 9fade2d25d90b2723a15aae9e453d87cd6725fcaddc106692ceaab45859e51f3
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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