Malicious PDF — malware analysis report

Static analysis result for SHA-256 e644bc4774770a13…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 07:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49d8de198263162086a05648a5fd414d SHA-1: 05249827422803be60e83924066a12ed6b4ce77c SHA-256: e644bc4774770a13decbf8eb82672e3271290ed3e4f37bb24eaa888913c62cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ascensionchina.com/userfiles/file/zirujepera.pdf In PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/xotawo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d20a43bc61add83e7d4ac34fd63916ef/jorumamup.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/30048428312.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/5c7bf2c8133070bf933f5df13718b166/wuzipewikoxidoku.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/fodaxosisumoboforipemam.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd018687c9---wuwatesukodisoguketala.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c774a508f0---40072344811.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xamugumixob.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/vuguxogimo.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/32137117843.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/11682656254.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/55025792667.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/27132387672.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/goloburuvovani.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/54326633726.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/78390126514.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609804d4db63a---berutajamilijatidij.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a9fcce9dbfd638a4eb31dde266f2ea10/17279103387.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/mapidaniwubuvebavoraz.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/91944935340.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/jozeg.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwoketitesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vote+of+thanks+speech+for+annual+day+pdfPDF 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_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 15024 bytes
SHA-256: 83fcc13522b468aa1424fc8d489da15298d39a7f0a781ffcfc6411469824d8d5
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10900 bytes
SHA-256: 27451f37e44150055fc281b94536d42216ab6e74771171e5da77f71fa2653863

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