Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeef329780e90648…

MALICIOUS

PDF

94.8 KB Created: 2021-07-28 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 135280ca9f49160043144fab919cf1ea SHA-1: 51c781abfb7bdda1648a843ef58daffc569f8ecc SHA-256: aeef329780e90648df8d391aea01dc1f41a89c6acc537b7bab4f1ede072d6986
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. Several heuristics indicate the PDF is a link farm, with many distinct hosts and URLs, some pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vaness-sens.fr/ckfinder/userfiles/files/valuxixova.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb396345d---69434512274.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4f1047f3c5624e0e08c08fcf5b35c60b/vunijazivafow.pdfIn PDF document text
    • http://soupworld.de/upload/file/14272351022.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bba12607a35---munojofoxapemipoxo.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/477f647acdd29e10a50e00b057da5370/37499878521.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e5ca97a153d326dbe203a176d3e811cd/17050646210.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/slbtcb6mj1hs6ofo1u0rvhidb3/77968329066.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/14c4ac30fe4fde788a1d659e98660ce9/nafazegaxaku.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/67299579519.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9d3b5514fc67ca65b3d9ffc6dfcccc65/48921014035.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/97542261743.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/10028727986.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/62dd822f4eae6aea18f97c027870148b/96449332361.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/24484439637.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/daa4168b596d4ccd82ed77a26df27814/8723453114.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jatatafasukilakiwiparak.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/sepozixori.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/rufadezalixo.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8f2d5c9317d3736e76f40ae79086beba/sidokatipomuviwezu.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/89105503067.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b51cdfda---95282242790.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6urhn17f4tjcmu5ccl1stc1f94/64381280418.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf5944b7b8---dunakiwazibilexaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+secret+history+of+consciousness+pdfPDF 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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 10684 bytes
SHA-256: 580b88750ebfc39aa0f6934c32f341b5506b3865583925501463cdbfba732992
font_01_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 17512 bytes
SHA-256: bf66d4e33f004277c020c5e031aabc75efc731522db2666bfa7e2d59a7c25da3
font_02_sfnt_off0001540f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1