Malicious PDF — malware analysis report

Static analysis result for SHA-256 093c0c1f9b5dbab9…

MALICIOUS

PDF

96.5 KB Created: 2021-09-18 08:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538863bab1861197704b267fc823eadf SHA-1: b28c4f4594ce7fffdace72e7572a75410d6b0c5b SHA-256: 093c0c1f9b5dbab9cd93e79def54fe9694476d5ae909d0466c6390bc13b75f34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://claudiodituri.it/uploads/4110497002.pdf
    • http://bsinteriordesigner.com/userfiles/files/41924261837.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/80080b185441627ab8b1137bab3b0694/42596457139.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/66610784294.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b16f1985d---31788812685.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161401a2b8ed0a---49982393134.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/91801049415.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/lomamewiravojolexadelazot.pdf
    • https://liho.cz/UserFiles/File/17313157840.pdf
    • http://sinoorchids.com/image/file/37608799693.pdf
    • http://velomagazin.hu/UserFiles/file/10095478697.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613773784eef1---dinudamikomonirafijuso.pdf
    • https://fivetc.vn/uploads/files/89837155057.pdf
    • http://ikuma-car.com/js/upload/files/wuweganusatefanaju.pdf
    • http://bn-biz.com/userData/board/file/17894001039.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/mamotag.pdf
    • http://rainternacional.com/userfiles/file/50706496660.pdf
    • http://kino-cosmik.ru/sadm_files/likezamukinupiwovexigav.pdf
    • http://www.pattyn360.com/upload/forum/files/64915686747.pdf
    • http://hcvitamin.com/webroot/img/files/desobofapilatozowewagavos.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8b2538df15b656fdcfc26a462b6ce5ab/23659870024.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5dd29c566745d7a7c712c22ac0dd00ca/fegogopuvakiduxe.pdf
    • http://apsara.ru/userfiles/file/15998455713.pdf
    • http://koreaseals.com/ckfinder/userfiles/files/94530274366.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=enlever+mode+s%C3%A9curis%C3%A9+android
    • 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_off00010f77.bin
5bdc8c6d05b9270e96cf734dcb2bd59b78b38933b5fe15c6d5954a8e9d9bb7e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 20116 bytes
font_01_sfnt_off0001420e.bin
0a33b92ad07affa7e551c80086ffce6030c9988b4cddac1684b0d3b010dbfa92
pdf-font-stream PDF embedded font (sfnt) at offset 0x1420E 10736 bytes
font_02_sfnt_off00015a5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5D 16792 bytes