Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6ed69c60af13a5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 19:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c59f01ff51667f03c5dad355aa6d5814 SHA-1: 592e6228737611d21e57795b2ef8b900d3962e1d SHA-256: 5a6ed69c60af13a5da63d0aed96c05131c13ff6448cf147cc6ef4706beb7d83d
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6663

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140929241dcc---7601680904.pdf In PDF document text
    • https://mogilew.ru/userfiles/file/44014083080.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b90ee894541807b6561825c6abcd7620/xewogaparabapaziserigi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/90479216357.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/32436120321.pdfIn PDF document text
    • https://langumeistras.lt/i/File/57265942177.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/tamorutolosinewem.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/87192959273.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/78185165347.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zapagomelifutaser.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab782b59a---9619593002.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140670e5b81f---60591934058.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/wavikufokure.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lixifemidawovulowapedul.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/batetevekoboku.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/soforepuzatijuda.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/18399243826.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/rumolijosipebigomegidot.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/68651793475.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/muwazuwix.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/53867271925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=google+chrome+video+downloader+for+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/fekubata.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 10848 bytes
SHA-256: 11005c420109fabbd426a3b2d0c026c2b3084672efb2efe65f26d4cb7530a621
font_02_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 16820 bytes
SHA-256: 8b82dea9fad2f0244ca087dc913333c6b4d744265c01ff0727bdfcb30a58f3b9

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