Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca4c7683d9205d5…

MALICIOUS

PDF

80.0 KB Created: 2021-08-16 23:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 572e3ca3e8aaaf3adee06d440ac2c87e SHA-1: 314ba07fbd98efc1f0599218251772c364c40b6e SHA-256: cca4c7683d9205d5662fb0451ddbe6e89c0c4e22a65e3f2f7b4c408ae1d26126
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links to PDF files on various domains suggests an attempt to obscure the true destination or spread malicious content across multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

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.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jurajogebubi.pdf In PDF document text
    • http://cablexconsulting.com/Upload/file/8823407751.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/sexubef.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dosiwagewuvimosebe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6t1tp2c9acgoi1n3m1e65dh9pl/43238332012.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qmceuliljpg4mcelooq60pa4l0/nagumefejep.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/nobijuwokefafefuban.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/kaburuxepupez.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106202217.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kamatipetinemitirogajevu.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/buxofi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/3912702827.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/60817905677.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3f6b7cea---xagiwo.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/setemurogiza.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210706_B1C0D9603ACBB616.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/mizomusar.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/70668426726.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/sawedipabowuzimiwez.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/70871576611.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afef69885---voxivekifoxowaxapiziluxav.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/rikanowarirolor.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/63778455225.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dai4hckf8lbpubio2tl7rqbe3/26851091284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=i+ain%27t+gonna+paint+no+more+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_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 17244 bytes
SHA-256: bed9fe5248e0795e88b10a57b88afe2464260f1c4e9823d0b5c84d694995fe10