Malicious PDF — malware analysis report

Static analysis result for SHA-256 926e61617113a18d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 00:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6f457d2d520f5e955fe95863cc9a0b6a SHA-1: 8203fa82c00bc64245b1e96676b9f9fabe3d74c0 SHA-256: 926e61617113a18db0c29e79a3052ed83caee97ef707b8a9fac55e1da1559ea4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://farmaciacogliate.it/userfiles/files/21420140493.pdf In PDF document text
    • http://vantaidongsaigon.com/uploads/files/88448517841.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/jisuwubitax.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109222334287577.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/ziwobusexetuwimowosap.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ae9185689f8060907a363c3a13f1deb/84054088207.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3f4926c24---xuzoxibew.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/22297472599.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///nusujofiwisepubal.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210915182619.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/289046281.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/73878041240.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/vagivujasuxubosetilebobiz.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/kumofodofera.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed8526232e---1712061508.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pipiruvifete.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/84197019298.pdfIn PDF document text
    • http://adriennemason.com/assets/files/59905476020.pdfIn PDF document text
    • http://jawarakreasi.com/file/71642540738.pdfIn PDF document text
    • http://mc-opony.pl/files/file/vilirelinixunuro.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61312BF0BF65E.pdfIn PDF document text
    • http://synphabase.ch/upload/file/1233449840.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8d177098f442915a4c69ffebe8015850/fulopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cricket+court+measurementsPDF 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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 15404 bytes
SHA-256: cb0d39e4649f74957177ede0570839dcd2d076f01ff068a647441fadd78983fa
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10568 bytes
SHA-256: 229294fc6e6b6127ef0f8b646e8bd997a7c2a680999b7ecfc896bf0a6e6cc269

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