Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a10ab53626ca377…

MALICIOUS

PDF

93.8 KB Created: 2021-08-03 08:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5630357bf33f5400674c233081b1692d SHA-1: cc01bb6f74614b7a1086133d92242416f459d47d SHA-256: 2a10ab53626ca3774e9ddc2b62a33d4989e6079effac48b477e2f3598b59a164
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a 'Browser extension / update installation lure' heuristic, indicating it's designed to trick users into installing malicious software. Multiple URLs are present, some pointing to compromised WordPress sites and others to disposable hosting, suggesting a distribution mechanism for malicious payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=aiag-vda+fmea+handbook+%28english+1st+2019%29.pdf PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070d09c32e8f---42147288576.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983a1152adf---77576086100.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b66690a---futuwojuvanaguwadowoj.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h7f7agaa65l0g45mljc2ahcs4u/69483639176.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/90800664392.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e62f49220---48598902996.pdfIn PDF document text
    • https://mauspro.net/upload/files/35197895991.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nukii71jhe3ovebmgf883704g1/zovewasutexa.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cq42gc8f3de5oliungs88968gv/27010330194.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/67120e08438efcbbef92340b3d9628b5/70714916325.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xunizazegigefojomovutexas.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2afb35b2b---93537812470.pdfPDF link annotation
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ap3d9ds1uqdv0bovcc88k2tm7k/voxoporapamidak.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/66e9c91248d5f278a5a95127a6a64e3b/wisupixogejezov.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609619ba49a54---pafusowokogodifumu.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/nakexuwusibizunawaz.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/96022cc306bd8b2ef8e36658b3c30f10/16906007840.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223068793934.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/kevijuwiguvibotupebi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100aeef2c223---vobudavuwe.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/nafolowenunofenizafer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 5516 bytes
SHA-256: 50e267be7c44ac9af9db91ff84dd11158123deb21bfcfcb2379d032984912de3
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 18584 bytes
SHA-256: 9f203d3049342885d9d8ca3a395b42bb72dcdfd82caf4738a085d3840610c31b
font_03_sfnt_off00014d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 11844 bytes
SHA-256: e97c98972dc9848c93cc41f7698551bc5feb37da258687227be1287ad7204d87