Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7149d29475e8f7d…

MALICIOUS

PDF

69.2 KB Created: 2021-07-07 08:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3a3a377f75dde138c85a0fd86b9ad91d SHA-1: 75a3b3806b8190e499fddb1db0b44a9995f4d291 SHA-256: b7149d29475e8f7dacd9a497cf2090fa36726f6255ffba69e35ad697692ee75c
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6772

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160721bb514dea---soxodefovakosokonij.pdf In PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tagekuzipunigimog.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/4083225587.pdfIn PDF document text
    • https://ancoraeducacion.com/images/16045612948.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/65043580850.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/15289713326.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6560a6025---85759577731.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82c55f692---89062035260.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e04d4061d---solilepegexu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fc9a6478f4a09203bc2514ea961cb447/xekagadufujun.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/epec4j7d7q6j0piamnkd2pav02/5960255979.pdfIn PDF document text
    • https://emmaushuis.org/pages/13884744785.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607726b1b302e---55172145459.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/49333105367.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510150214622142.pdfIn PDF document text
    • http://wawa757.com/uploads/files/domotuvemijerewebepoputaf.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b17d33a2ca2---70787153070.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/72634053454.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160943ffb755fc---momuligelulejuxux.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sufuteredegux.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/80607414860.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8fa7d04---92319950044.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d4b50750---sajawisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+does+dtf+mean+in+textPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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