Malicious PDF — malware analysis report

Static analysis result for SHA-256 85161f920eb52666…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 12:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05be420e99ec3350a524d8a3d446e773 SHA-1: c832b80077f8232427a359b30d4a2523dc37244d SHA-256: 85161f920eb52666a5443d0a5a6cd188f82cdd4053b7553731e149f2ecbcd7a7
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple external links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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 http://domplus.su/userfiles/files/46653638249.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380aa7b6df7---kezurogewekaforibovev.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/muxujabiwididonava.pdfIn PDF document text
    • https://hirurgija.me/files/15461464196.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lukanemutojapis.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/90363679911.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49772062524.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d83567cee---lulizesen.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917135500707253.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa6ea78d4---52342280220.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/15770814460.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ba855ff---rafigozemufumebunofewu.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/17976356062.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/37961659567.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/42219792811.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xetikogutodetutekeje.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014023c010---88533109152.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/80720841210.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/84061904358.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9f8a1ab6---ledelokisevubejakunuxi.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/vimeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kingroot+android+latest+versionPDF 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_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 10480 bytes
SHA-256: b9dccba5c84977f914aec54e0e053caba65987bad09d53409203c184d3144128
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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