Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b230ecb999c88d…

MALICIOUS

PDF

96.4 KB Created: 2021-06-28 04:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d93d785eb7e60e6507d34b8d0eec0535 SHA-1: be1a7593a72788eafbfac719a5d37ff324b3012a SHA-256: 52b230ecb999c88de27ece181e69b3896c56a9b3173e8bada141d2a405d51b2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely to facilitate a phishing or malware download scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • 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 http://muslimofwestbengal.com/mwb/editor_upload/files/48957089310.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d07c059d07---lawasosuxonu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v5m2c6fk7p6ef89sk6muc81pf6/5486821862.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbdf734feb---2550225199.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/03rbtpar9d2l0quvaad3b23d36/73560095992.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16098408dcf105---27082509809.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa086a67c9f---samupukut.pdfIn PDF document text
    • http://industrialdevices.in/uploads/zetewefafufozanukoxat.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32334927192.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ee903002---76680402669.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pvsd26avh5nq6a5g11u4a606f5/34298202422.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tidufojubijonunumokomowo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee53f6316b---lomosekewetosidowapuka.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/35775101839.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a995230ef28---balakoruxud.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/88469102769.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/zilija.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/31754431651.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/velurixoxobupatoz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072356a48747---goxuwonalazojijixebafo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/41570705360.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4b37be7---poxoxovisituxebeluni.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fuvidagevapodopire.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/bikutipazagekuzibokularoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hotstar+premium+for+free+downloadPDF link annotation
    • 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_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 18040 bytes
SHA-256: c1f745c9cfee58848ea19750655aa360a9341904680acd2de116ca8bf41fa85d
font_02_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 10836 bytes
SHA-256: 7295948c9b57e9c9c3a37234f5ddbb31018d24f6d72414f789ba23fc407929de

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