Malicious PDF — malware analysis report

Static analysis result for SHA-256 4333a07f86f737e3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5897caec26c5a21f552ce60906dab8ed SHA-1: d6ea404357be6aed3d662e8bc4eff8c680b42d38 SHA-256: 4333a07f86f737e3114f46cf428f6073756135393bc311ff52b3116d850954be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://hesexpo.com/img/editor/image/file/43886875879.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2faac3823e5b6b4083d092faa928de57/60415470271.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/zoxejixumozonapajobo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106242219502960.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81430521244.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/teganava.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad580e95a---71045788650.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/34caf9eab5470333facc56720fa4255b/dokod.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/gijupup.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/73196371414.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/mezumopafalekifuletipug.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/26826461605.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/74054535946.pdfIn PDF document text
    • http://franciscakeryandcatering.com/clients/61981/File/17590390212.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/sufejuj.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b385419b9e7---62925381441.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/70651232224.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/ximegukefiz.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/28598603149.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/clv9scj3r5905abjhghggm6el8/55287935718.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a433d6a2925---gibuwefomegowelenin.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/32977678402.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/46066238337.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/43169357135.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/20707419900.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef26cf127adc0b6bfdcc8c09aa9648a8/bejira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=graco+recline+n+ride+car+seat+manualPDF 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_off0000b51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 14564 bytes
SHA-256: 11835ff567ee732b2f1524cc250745724c65ba006f0d454e1400a59a01ca7035
font_01_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 10672 bytes
SHA-256: b7ab739499401acdaf94645fcf29e86a7f00f32620a5e54f7a8bca8b6e5f996d
font_02_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1