Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb0c8b28e90747a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 04:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 307796e6d9d2c4cb51c0d5aee1d6df3b SHA-1: 4509ab07b2fff65c36fce79a9fc160f2afaa8f1f SHA-256: 2eb0c8b28e90747ac2d8241d8947bbeb1a580db94deaa1a843b1748dddfe66bc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to link farms hosted on compromised or disposable domains. These elements suggest an attempt to redirect users to download malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=minecraft+apk+original+version
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/46514535791.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/jevoteke.pdf
    • http://fasson.vip/images/editor/files/zavosukitarogasibawisum.pdf
    • http://manu-transport.com/documents/file/pikeganizipilupifalola.pdf
    • http://rockbond-aac.com/id-admin/fckImages/file/47967441422.pdf
    • http://www.oomewatersport.nl/upload/files/vogere.pdf
    • http://mega-gold.com/userfiles/files/39849155813.pdf
    • http://trips-in.com/ckupload/files/bakifaz.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe0a1f6d6---defaxozeza.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/vifebakilalozelen.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef81a1e50---41544900572.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/511c41f9800ca82ffde15dabfad8c507/mumutevasego.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdf
    • https://santehsevast.ru/userfiles/files/dibenowuwifetop.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf9a48a3f---14066491622.pdf
    • https://curtain.jinware.com/upload/files/53585237205.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/maxofogumukuzekogozijig.pdf
    • http://fioredda.com/userfiles/files/xabuwebuwer.pdf
    • https://raljob.com/userfiles/file/dowobibumifuguvu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9a66f6c7---27155918517.pdf
    • http://pyramidplaster.com/file_media/file_image/file/84927913939.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/zovikiferilitiginisuweza.pdf
    • http://dongshengcable.com/images/upload/File/19999052197.pdf
    • http://timebymtm.com/upload/files/juvozawis.pdf
    • https://robindayne.com/ckfinder/userfiles/files/42574691386.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_off0000db74.bin
87fb1841fd961fa2f1e3dc174a8cf0bc3af0556ddd9dc55dfd79e55fed48c33a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10808 bytes
font_01_sfnt_off0000f48b.bin
6bebd65b19182a101788b1a2618c430700337fef35e96a754c9d74e9294a9f38
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 20024 bytes
font_02_sfnt_off00012888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16792 bytes