Malicious PDF — malware analysis report

Static analysis result for SHA-256 4959694c9fd5ca7f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 04:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b4cffdbe1799963e0338d97d3a0eee5 SHA-1: 1d819a311469ea90526e346eee7a493fa5710c76 SHA-256: 4959694c9fd5ca7f1d8cb675df4a67167f81cef83e2ed4c549825b070ce893ad
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations used for hosting PDF files. This suggests a phishing or redirection campaign, likely delivered as a spearphishing attachment. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

Heuristics 5

  • 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
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/69659aeff50cc9eaa5dd41ff8088c343/mukabigafotolofativavilem.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021051410362257.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/5790018442.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/185e318ffd55d28e61cabe0e3d92d22e/rezuxepeweze.pdfIn PDF document text
    • http://maihome.hu/admin1/file/53872923716.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/gobufekujopakinodegomiw.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/31824014315.pdfIn PDF document text
    • http://agrion.org/upload/fichier/renafarugipezijo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/kfekelegi5q3r2i3e91h6893h2/95604679308.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/22713729162.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a3042223a053092be895a0ef26acf582/83778515438.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/51461414577.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/25371543655.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/88155439296.pdfIn PDF document text
    • http://kelsenator.com/userimages/juzutapixujavabuzarope.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/17375058323.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/47724867235.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/05bf3c0324cd0619a72a1b6e915e5836/42276464.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/05dbc8308eeabd98510c0fe22303891c/30769983177.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/sedeguko.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zutuxidugeb.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/34255242741.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e89d5f65686---nobodutilipilukak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=short+story+book+pdf+filePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 10748 bytes
SHA-256: 4ad01d0f2fa3b703abddef30114fac914e1a46f804cc57057761c208b0c660c8
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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