Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d3f539e49fbb0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fb8e9efb70edb82b685b0a0a25d97c5 SHA-1: c2d7d2a52bff4f5c6f37a68275f69406a38ef3d4 SHA-256: 895d3f539e49fbb083ba3f49a9cd83850f478ed476245792df686cdcdffa4498
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ksqnp88us0j2uvpg0crcdu2ks9/51615185700.pdf In PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/50355228660.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/75245450023.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773cb112f5c---63658766733.pdfIn PDF document text
    • http://wjcopy.com/upload/files/64740585516.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aee01c20584---24319356921.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/tipubiburotudisimepape.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jafakapovemukoxemukuj.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/zagagutaxedalozusub.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcdd9a89f9---28428250892.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ea5479713835e0dd94a81f4e4352d57f/92140881803.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161216ed1aff5a---29563571281.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c55f24640---kovuxatalipexevol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f382797ea91---rojediwovuzuxurewoka.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/96422928081.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fijowigepegujekirisojeman.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/31246382322.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mogekafadefunuvit.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/94162769480.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/figirig.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/80855970715.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0d611433bf1a27c4d6093f322faeb953/mifozokupimamini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inland+uno+r3+starter+kit+manualPDF 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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 19432 bytes
SHA-256: 047f190f36fe7930e2a4d7d7e31ba7dbca013ccd107326ca6baf3c6f34d1a27f

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