Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f09b4a6307335…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 20:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bbe814f19446b6d6b1aaab3ad86d6e0 SHA-1: e56ff4f9eee1423d7d548cecfa2151aa776790d9 SHA-256: ef7f09b4a6307335221c8ba7d7e9e1b0c4d284ca308a4e12379d2d69a8569929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those on disposable hosting and pointing to potentially malicious content, strongly suggests an intent to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=android+game+programming+by+example PDF link annotation
    • http://artetendasud.it/userfiles/files/88554940879.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/zutuxiwawekerin.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/guwefovululel.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/95448897504.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140636a98732---pebilisosasi.pdfIn PDF document text
    • http://uchid.com/uploads/file/babulumebuzira.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/masuzokataze.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nuletonova.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujapupegu.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/85190919834.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kuranilekexubufomobaru.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138713119847---vesivokowejat.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/84714873360.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/nunebubivizoxawulajosedi.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/9035298357.pdfIn PDF document text
    • http://mobilenmr.com/files/files/74939574111.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304262f1b4---37016349015.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/19797586604.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sadovuriperisalage.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/84616299477.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/numafo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nuwoxogamujavarifadalo.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/moxefigefapuzuzusiw.pdfIn PDF document text
    • 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_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 16248 bytes
SHA-256: 6531b9b80eb9caef3b1250f943cd2ffef05dae88508b9e5fcf8c48f43c30d878
font_01_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 10804 bytes
SHA-256: da52c4468e80edeccc198ad4a171cf75be6c94f6c38854c36c7826e446667b2e
font_02_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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