Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c4aa3c58c75b73…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 02:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d30f58ab2d84a7107a15c831ce128623 SHA-1: 3414aae6e9cd370bb5da0a770ad85db28474d20e SHA-256: 46c4aa3c58c75b73430598952f12b9676403727f35b31a773244e8e3fb1bc030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=redmi+9+prime+is+a+gaming+phone
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b87386b---kivixugugewunupijasuj.pdf
    • http://designklasse.de/ckfinder/userfiles/files/43912928919.pdf
    • http://brmhn.com/userfiles/file/20210906232931_d0ezo2.pdf
    • http://jl-vacuum.com/upload/files/1166960536.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jurowo.pdf
    • http://oldadmin.k12cart.com/media/files/20875200535.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1f287747512f5467732bd089de041a5b/depazuzo.pdf
    • http://koddous.com/userfiles/file/vuvofobez.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sugimejaxerabijuboredajef.pdf
    • http://handgun.ee/media/file/didonolofezugopisugoji.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gbd147274s6md3lg29ne9ap1jq/wovab.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/siminudenemoj.pdf
    • http://phuketdriveschool.com/userfiles/file/58959592499.pdf
    • http://teamtrinity.net/trinitya/file/97555104345.pdf
    • http://zge-led.com/luodan/images/userfiles/file/tumaxojofofo.pdf
    • https://sk-elektron.ru/ckfinder/userfiles/files/66113936413.pdf
    • https://perkunasstudio.com/uploads/files/202109152014509911.pdf
    • https://leresto-niort.fr/images/userfiles/files/45593598078.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451a22133d4---34500797060.pdf
    • https://topupdana.com/contents/files/togovugugegavuju.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_off0000f8a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
font_01_sfnt_off000110b7.bin
73c2ae09fd13cb84f029e7caed7590d66befd71b99e6e0c53a21619281ad1377
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 18780 bytes
font_02_sfnt_off00014233.bin
915331660971bfaf37bca6be4ae38649448a4d39fd9275eb45a04945ed3294b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14233 10908 bytes