Malicious PDF — malware analysis report

Static analysis result for SHA-256 956f5fde2db598f0…

MALICIOUS

PDF

84.8 KB Created: 2021-10-09 02:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466350e73575d90ca02ae9b0c23ffc5b SHA-1: 25082f44add9041f5925e177babb734e5d6aadef SHA-256: 956f5fde2db598f0c8adf9b0a35913c10960999712ae047b01e3ed38873b38dd
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, including to compromised CMS uploads, suggesting it's designed to exploit vulnerabilities or trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the malicious workflow, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=nifty+50+companies+list+pdf+download
    • http://peaceinsrilanka.lk/userfiles/file/22967253294.pdf
    • https://soudurelauziere.com/upload/editor/file/71615541425.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/8393301999.pdf
    • http://anipetkingdom.com/webroot/img/files/14460127820.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd54f98775---74753147502.pdf
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/togoruperapazorijibedujep.pdf
    • http://lifecontinues.ru/images/files/14834931594.pdf
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94159726484.pdf
    • https://sokolzgierz.pl/web/uploads/files/30370424426.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d88946a---dijajebitos.pdf
    • http://p-energo.ru/content/file/9991886251.pdf
    • http://zdrowejaja.com/Upload/file/xunopugofebo.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/41664863462.pdf
    • http://pilot-market.ru/new/files/file/makunijijibelujedebilo.pdf
    • http://generaltubi.com/container/ckfiles/files/lufagojuv.pdf
    • http://greatnice.club/updatefiles/file/56582310524.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/829c5e09a98ab8943b765f9cef76b76d/xawinukasubasibakodive.pdf
    • http://thangmayedex.com/webroot/img/files/89740771154.pdf
    • https://pqclass.kr/imgs/file/23805841679.pdf
    • http://metabolit.ru/files/file/xakiverujabiwateb.pdf
    • http://shiinamotors.com/js/upload/files/rinaposozututesuk.pdf
    • https://e-room.co/userfiles/file/5848143465.pdf
    • http://sochisushi.nl/survey/userfiles/files/nafasesinenomogito.pdf
    • https://dagvandearchitectuur.be/_files/file/jibajifiselazopezo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debf.bin
e910ea19cf660caac4a49ead170668a2d42f7a8505b0e9f58711d1c22546eeb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 11116 bytes
font_01_sfnt_off0000f8c4.bin
d1c099b72c604bca6541eb16c42d288366499275e697de700827045f45f3b532
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 19740 bytes
font_02_sfnt_off00012d62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes