Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ee14a29d52254…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 15:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58117cfcb0b6c3599108efdae4fa04ea SHA-1: 952dde793b7ed4c701400ee60b582e24a09fa1ba SHA-256: ff7ee14a29d52254bdfdde635af980a72e47b55d7bbbfb1fcaf724ed007924fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78f30809---67168435056.pdf
    • http://thebankcardservices.com/uploads/files/15300511048.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/494729f6b7c032210e838873501bfb4f/62814550916.pdf
    • https://renetravel.ro/images/files/50096923165.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072678d2acf6---besujobibakamasura.pdf
    • https://glaskunstcentrum.nl/images/file/38756622390.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d31f8ef9451b580bbe0f45af42d1e04f/xifibebaxe.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/93b85a11dab535d18cf172648e2a8e9f/15312355805.pdf
    • https://angkagenap.com/contents//files/lizugatatudubusejozikul.pdf
    • http://files.ibiza-ferien.de/file/pubaduvutuwekivokanajasax.pdf
    • http://7166867.ru/ckfinder/userfiles/files/vebizuvozalutaralezivapux.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/1105127703.pdf
    • http://praguetransfer.com/files/file/53656256092.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2ebe92b0---40501518682.pdf
    • http://volvo-cars.jp/js/upload/files/putefa.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/56182035611.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/aabb289a8ce6ed7e670eb77397e4f06c/nukosirabegaruki.pdf
    • http://driscollandgibson.com/images/edit_images/file/58753755576.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608434ebc1146---wibavisorevudok.pdf
    • http://stroi-sistema.ru/img/98604124739.pdf
    • http://briquettemachinery.com/d/files/41803950909.pdf
    • http://jfe.hk/userfiles/getobulaxolobunatiko.pdf
    • http://rockpapersun.com/upload_mce_image/file/rikak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hyundai+santa+fe+2009+owners+manual
    • 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_off0000d26b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16792 bytes
font_01_sfnt_off0000ea7d.bin
b8ccc834a51a201bbeb5c9296d31d9fc06640a4d9d04d077edb2ef3c378c9326
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 16964 bytes
font_02_sfnt_off000116ca.bin
169c4fef907f7a20abe9752b9ab7f9080c6bfb36d4696693018bc8a820212a3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 11216 bytes