Malicious PDF — malware analysis report

Static analysis result for SHA-256 952c40cbb38008f2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 14:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d8276c335aa6c8d07411a22170c6039 SHA-1: 0049d6102c7382761b66138de04462fb49453ca6 SHA-256: 952c40cbb38008f29d2e39b901e53a8ebb221422bc65e3b08627e519c5bf842c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://maffart-guy.com/userfiles/file/65877936423.pdf In PDF document text
    • http://praconsulgroup.ru/pict/file/78332998639.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/84569170364.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/muwaloniradijelotoxuginis.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/labero.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/waxozeg.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lmpdhtt1ftehomeljheeglf8ms/bisokebu.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/17513856346.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f932501c8---14723194925.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100dae427a40---tovexemagovoreb.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4eace95e2---89195088245.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607e144482c0a---89958541031.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/21043662074.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a321c068c34---32217417361.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/50772985526.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda8e550d---lojoxa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/79b8ccb8c0b2f74f2ee0a3c21a069057/webelugenujubun.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/58110312291.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/paxilizogefekusizubesizu.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/69827206722.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4782405099dfa0ac8c599949f5cbf69f/22584553207.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/soxopeworabonobezebi.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/wudubaxo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111891aa9924---simefuruxovakotopefafuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aditya+birla+mutual+fund+common+transaction+form+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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 10984 bytes
SHA-256: 6f1a7920b5a149bc4c2c6c464c24ae6459ea612d79e85704f55a8e56457d0388
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 17208 bytes
SHA-256: 64e0413593148e46ffe0f66f8f609ede34c159eae606743b75d024e01de87eda