Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34a90f9f3faa7c5…

MALICIOUS

PDF

58.2 KB Created: 2021-09-04 00:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd7c50e569e04467c07576d5e7cd6d47 SHA-1: c8da87cba2b1ca20e00affefa3e1e65c45d4ce7e SHA-256: e34a90f9f3faa7c5e118a4c2eeacacd121e28afda84de9ce37939f5bee7b2e3b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7076

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://koyomisushi.com/uploads/files/21717716288.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d216c65e6---63983362487.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/87739486730.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cr3u70b9tugu8nknutjr7nfl32/polofamiravumisas.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210624060807_jzthgn.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6ba56649---96328191369.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/80737971734.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af70b0f17f6---30681593174.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021083023264773499.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc0a22841---ritikugunawot.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb09863f85---85484002849.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/potisoxusisu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8f227d8---22135997580.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5acc7b2da9fe231e7065fbbdef61dea1/buposutilugajawi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sijidesasirusudul.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee41c38de---10462460747.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/tegusinutelupekomakujar.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf500d59a1b---68221115041.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2bm3st8houikuc0vfgsoivbi12/95476887014.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/45768627803.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/warurogikedox.pdfIn PDF document text
    • http://momsystem.ru/public/file/5706961102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rguhs+convocation+form+pdfPDF 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_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 11100 bytes
SHA-256: bff22ce83731f02cfc08f269f85fb23d2b591526aa5ef39c144b082988a2c97b
font_01_sfnt_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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