Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fda98c90155eb7…

MALICIOUS

PDF

81.9 KB Created: 2021-08-22 02:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1d620fe75d720302b7e4b6f6ed633dff SHA-1: ecb2c12cb8937bfaf072ff368341291b6f069257 SHA-256: 89fda98c90155eb7bcb41d16ea8f7f2426ee3765c784472d35e37609187dc2b5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links likely serve as a link farm to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=how+to+adjust+flushmate+actuator PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe020795a53---gowatobodemiduwak.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/31164870381.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/if446u2d2ktt7gdoimen40jda1/pokanejojoxinegoxa.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/59640253610.pdfIn PDF document text
    • http://labsshop.com/d/files/36460210478.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/losomujalir.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/xexumug.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/22801377230.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/75613426013.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae531276220---zuvupezafonekebide.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/2271034664.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/xarewunom.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/bejifi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/43207503188.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb8145190---didizebatizotusunevoxoxa.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/lokemaril.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cfc608a082eb4be8b83a7e44a200a642/rebejitukito.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6k14mp15tq6kka82qauf6ghgen/5634793588.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4e177380---88038824481.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/55383829406.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 16724 bytes
SHA-256: 5b7ba7f5700b9a92cd0cdada82ccbfae47787c5cc9cf9a7c983f9e00ec78d0c3
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10852 bytes
SHA-256: 2293ecd7cfad99784750e74d0d286c1d42f29f3d62b5d5b8871e67fa7e80bf28

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