Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3005e4e6f042b2b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 19:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b811ffb69c6c3c34b9abc28e100d7a9a SHA-1: 71df92649e29a71a8ee112f56c1ca34034e64fbc SHA-256: a3005e4e6f042b2b5ef37d08333b6c4f956891321e8e6206a5d3a76cbf6f487b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://kondicionery-elektrostal.ru/upload_picture/file/75551778541.pdf In PDF document text
    • https://riolisboa.com/images/ul_files/file/c3ITUayvC90K.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5ee7c78e---zejaf.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79a382e89---21290458740.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/25655755793.pdfIn PDF document text
    • https://sitarasign.ir/data/file/bonokowo.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/2216952640.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/15583592711.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/budemumin.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tukilibaniz.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/dagidumowegobidepizu.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vanolowojudeligapulesema.pdfIn PDF document text
    • http://thuannam.com/image/files/67965071127.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/90026670574.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161434ddd0c923---bibaximifip.pdfIn PDF document text
    • http://zgic.ru/!upload/files/57298123103.pdfIn PDF document text
    • https://cape-electronics.com/media/file/82707538421.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219317458208.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/46431111394.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/lugopubogifagubagusomopi.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/25449171648.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/pufujepuwexoduduni.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/roxis.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/2296413058.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nifadepabaziwaruvime.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/56269015253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=benefits+self+driving+carsPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 17812 bytes
SHA-256: d1ee1875f012b0a1ad52174bd9fdac70046ade519fa753132c15a744430f1f57
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 10652 bytes
SHA-256: e0ba0be8ca28ae0ff3368fa67c2cc4494d97f6a6101560a7e037e08bb462076c

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