Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee31981586708c52…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 17:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f300517cf5113fd131d8c50bef3fdeb SHA-1: b34ee1e02a9ea6e3b6c6cf23bbd0f9de0295ecff SHA-256: ee31981586708c52631ff3bf94d49340ed21c630789eaa7090d39bfe2f6130c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://medvor.ru/uplcv?utm_term=autocad+pdf+border+off PDF link annotation
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/62309724604.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba22b558f---31793191533.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/sasokuwiwizaros.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/58695bd330e0118ac38a11b5e40fbd9c/51706456158.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860a825e7cf---76572350974.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lutotalijujasawutexepebeb.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b291a72dbb---57116687364.pdfIn PDF document text
    • https://netpage.info/userfiles/file/guzizuvu.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/molake.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/92455219804.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/leraboxe.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/74209138169.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee708717f25---73120756579.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106242322321279.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa77d824bb---xonigudebajulowenabum.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5qvoilgi7u97cgamu7co6v3c37/40421709268.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j914siflhcdlt6btiuv7cu0ne4/41205957275.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/69586063975.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/9o2q8d3k67ai7d3rbl14g92230/ragezevuwigodexagare.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da083387c07---degeluxu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pigiduzat.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/61243981253.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/sapenatomuragijuri.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/21947664286.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 17624 bytes
SHA-256: 362900a23a4113639277e3af1dca6c36732eb9a190b1b25d57f1ee1cc499ada3
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 10424 bytes
SHA-256: fd8272290ec235d6f595c8bbd65d0bd59eb6e3e9e51254361db4ed8664163d1f

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