Malicious PDF — malware analysis report

Static analysis result for SHA-256 786e320792a7ef3a…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 09:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 47616326f16d032d9e670bf5fc946ef2 SHA-1: fe0232dd270f6e22c61c9ad42b55e3e943d6a53c SHA-256: 786e320792a7ef3a88c67d9403d848ac2b5284f045f451017430f9c50a127f71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://altinay-law.com/images/file/32580833485.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/598531ee7a12ef755df4885a7e7ed734/bumifedo.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/70171447742.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/5389139309.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3f5d23dd---13836027587.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4750b7e6028675877a573e2a9dffad7d/66541321916.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7eddd7002f75805b7d66775de57c002a/18738916808.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/61262810460.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/623b25a8d8938566df7b5d7e0dc60e65/toxasugisolixod.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/95089378716.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/59f9607e420f23c9c5eacac9a4b99e15/24207405532.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fagalofute.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/jisozefonizifagolapazubi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/fewogagiwabise.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd62b8f1d---xixiza.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/50c7b6cbf7a8bc86049a4572694f68b1/febafuvazilafef.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40aef41b16---98570782179.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e32c7cae5ff91469c16d2270ed0bca18/55554843714.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9u8qq6v8faonbhrtmk9p4ndbrp/nulojojozifobo.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608463abebf40---niranedulavotoze.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/ruwujifurulasonifiwaromo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a50a7c4ad6b8c49f6c361bdeb874c27/merukiregovosuzobara.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/begolifavulided.pdfIn PDF document text
    • http://haphadoor.com/upload/files/62853612277.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb3daf6e5---73505898475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gate+ee+2019+question+paperPDF link annotation
    • 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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 17596 bytes
SHA-256: faf052bafa6fa04efaac069ca0649169c151e15223b5b54dffae914bb05fc48b
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10948 bytes
SHA-256: 5bafa798ddcc881bd1c44f0a7d60250ca96d8927e4c35283d4d1a43e68320b70
font_02_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1