Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80c698e2c3e4dd6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 22:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5ec9866876d5a75d5107cb99398d0f SHA-1: 1005f87c122a6b0c2d7e6a73a37d0d314976db3b SHA-256: e80c698e2c3e4dd6abc035857e48f393b556dfc18652aa85ad47e1d0b0361858
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pnvvr.ro/userfiles/file/57464780488.pdf
    • http://laureysnv.be/uploads/files/60320025060.pdf
    • http://master-br.ru/img/file/57888828941.pdf
    • https://aviatroglo.fr/IMG/file/26137144565.pdf
    • http://beta-rc.com/upload/files/mikegudewamom.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/d1abe5c1d2db349667586a3c1b4972d0.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/ginizidiruwopuxilegal.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/dewixi.pdf
    • http://wangguanhardware.com/userfiles/file/39631308295.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/a1dca88457b8fd6542855bf756db691d/18914288216.pdf
    • https://angkaganjil.com/contents/files/88449538138.pdf
    • http://merwepizza.com/upload/file/83761482223.pdf
    • http://wefocusdesign.com/upload/files/79997724381.pdf
    • http://evolution-dev.com/file_media/file_image/file/jarukalitatovizetaxixuvi.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cc759641---gujavatagarexabo.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/46378374996.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qeg8u1hkvr232u5qjqpp2ic090/88968739490.pdf
    • http://muszempilla.com/files/file/buwegeje.pdf
    • http://metabolit.ru/files/file/junogemopafujamok.pdf
    • https://srmhomes.com/images/bulk_images/files/28462066622.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/7586214470.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amazon+music+unlimited+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90d.bin
fb54c0bca3645693fecdfc6c6d06c2d6aedbae1a8c33acb13f53032b8c2dff68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 18056 bytes
font_01_sfnt_off00010899.bin
7edc7ae2628f291246a76d345aca4adb9c340929821612ee8e12bcd9d40a16b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 10808 bytes
font_02_sfnt_off0001219f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 16792 bytes