Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bae97877cbea52…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 02:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76160d7c6db7b1aa1ea5ff282ec89105 SHA-1: 7cc88dd625b1adf7fcd2154a001b3e0549779484 SHA-256: c4bae97877cbea524a7e0ed0a551a038b82c65aa2f6c335d9aa2f803ecca2604
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://valencia.thepokeluau.com/uploads/files/xurelowoxenimajonig.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b46a1eb7c6ddc0d7abb5f1b3b5608403/sixinaxutoxomimovibofu.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/94465857683.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd01368b1---menoxinaxunedakaxemu.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/dikemunuvonugutuxe.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/7563657366.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/wewimuvatasakazobedu.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/tapozulejotoxowunemav.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pafoxalawuzigibaseduf.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/91122922538.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/85665988410.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/70808147888.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/17170891218.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/89891882798.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/pufilidudanedexexekate.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/11940398019.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/83570357545.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/banefijobigifusex.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///bonaxegadasofetopoju.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/13618810318.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pev7d91nlv6n00mktcceh1heun/rorusopisuvisax.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/zilekun.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/belasuvibijesoguluwune.pdfIn PDF document text
    • https://stormester.no/files/file/ginifanifutaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tom+and+jerry+movie+magic+ringPDF link annotation
    • http://forum-auto.ru/data/files/61422675186.pdfIn PDF document text
    • 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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10676 bytes
SHA-256: dfe70786edf5fb87a7a26d43d5d22577db6a84423df38d7eba87f786467c1e1b
font_01_sfnt_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 15488 bytes
SHA-256: 8a04e1aaf652d6d9d5c2fd277691fe64840d39a3816d682226fc9fb9f116faf7
font_02_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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