Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce7874b8c035245…

MALICIOUS

PDF

99.9 KB Created: 2021-08-09 11:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0ec47c36cce9ec75ac4823c2d4b6e764 SHA-1: d0776bc9dcb105f3a7c63b2121775d442449f7db SHA-256: 3ce7874b8c035245743d289370fdd4f8cd09fed818cb2ac853c3f53e6878c54f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is likely used to facilitate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://campermagazine.tv/public/file/mefomo.pdf In PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/8945783181.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3cb8e1d4388c2b6d267cf9fabdb5eb43/vilozuvuxed.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/286c3000cc65829dc595a9e81a672b30/55600044945.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7f2eb5543---jejeved.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/retabuwav.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/domovanomozaritan.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/natitugotevegusadif.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/xepogimefumip.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/jefifukujatu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5132a4f7a0---verebovonipuwekujegoba.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb26dfa1e---96251926091.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6ea61db---jefipasewexiluwevivakupe.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/narinovo.pdfIn PDF document text
    • https://led7.ru/file/824447689.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/77595535567.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a443b22ccb93066ab8cfa09f9865ddcf/sekosuzemudib.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c8cef076932fbabb789f61df3e860f5f/14480963475.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160983d3e450f6---dewedid.pdfIn PDF document text
    • http://santabruna.cl/upload/file/73948678108.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/rimelufatinid.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210624181117896344680z6z.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pcsx2+emulator+download+with+bios+and+plugins+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16212 bytes
SHA-256: de39cf5d09e99c2dd66270e0e5585774219c6b386c56166ef0fd004ac8521f55
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 18224 bytes
SHA-256: f95906f8512b570ffc03643ee5d525c4e4b271cfdbb2989882fd2a47d008f581
font_03_sfnt_off000165fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FE 11616 bytes
SHA-256: 35f1c2f03f954854b3e7e983f2b7afa89bfc4a894a4afced61be608364b6a379