Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5c7c796333e926…

MALICIOUS

PDF

63.6 KB Created: 2021-08-16 00:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fabc08ef24e0f6d2e4aa8e6c0135774b SHA-1: c77ebf0a73f18b29e57ec6d96047309568498553 SHA-256: ad5c7c796333e9267bf30ea7713bc1047ea162d80b5dd66efe89010118b7d021
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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://sacc-la-chaux-de-fonds.ch/fichiers/file/16200892279.pdf In PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/posagudib.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bigorixevibi.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/kizim.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/deweriruvovefutipanosemam.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160962db58c288---23853642752.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/313bb539483e3633afd0c3e2b78edd25/30181498949.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d4d95549fa003b76e99458440ed58bc9/29975227711.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/fusogu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/eaa2dbdba4d9fae9e6dc9e592ee50ff1/ladebokid.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/15803536924.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5n1q6nfoe276lsbt3a8ceii9pd/jogofuge.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa91d18eb---dolibojafikegejola.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05b1cfe86c114caf6236542fdcbc6672/tuzegefiforiwu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2de8e8eb6---guwibezotabamu.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26379562783.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/8030579489.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/negitonidagemak.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/bonezubufaxu.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/bavoginuxeralolovufipita.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/58ob53gg825a01nbv14du4lfc2/nimunipizex.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/47933813166.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494c6736f7---kepokifokukafefus.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/solubilememarezo.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+crucible+act+3+and+4+quiz+answer+keyPDF 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_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 11296 bytes
SHA-256: 6641becbb84ece1c774a6e3b154f9ceaf6359d1bf17f3dffea3f2ab6b9a4d0e4
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1