Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1898f2978edd12…

MALICIOUS

PDF

94.0 KB Created: 2021-08-10 01:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d62e89db479b133dd6efd7432f205149 SHA-1: 8dd72760b34edeabfab0fe7110f9ffa5270eb54e SHA-256: 6d1898f2978edd12aa8c15218794b4a5af6bfff101533ab60149303093c03490
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Several heuristics indicate the PDF is part of a link farm pointing to compromised websites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/lozibubezud.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16108e56d093aa---64916757817.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15724a399---sezoratoke.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607479f2eda34---zupaxizenoguxufukuzisat.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/77395605658.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/424efef4b4e408b4e9d58c1ba94bc868/sasuzagilujepejavo.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/lagujutuwisozululiseridef.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/onne0dihtn6q1isui1d82njcs1/fagitud.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakedilaloxutibuvifo.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/44306931176.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a0c3129ce3d61a114e674a21ebe0063f/71545391699.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/laxitulamanese.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xinepijex.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/66336610942.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608280c48a651---30594603564.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c773434248e---budevo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107edfc1507b---bajasaxilikotudoma.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/zotevikokogosugo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2cf7b030---57902363914.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/wuvoturosejenunatosa.pdfIn PDF document text
    • http://aa-nusd.jp/19751823250.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/kdiu1l4rg07c4int6ka3lkltjl/dovoxifoxobumefixadivaj.pdfIn PDF document text
    • https://airshow-bg.com/file/ruleredoremetuwov.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ptrcp3qepitrkreb9ucgptsv1m/wepomuzitaruvojanovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=revising+and+editing+worksheets+answersPDF 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_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 10768 bytes
SHA-256: aa62c8a36a8922e89489490e6b160507ad3ce7b56b8150124c5e49a5337bb14f
font_02_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 16680 bytes
SHA-256: 57b514257b1f0afe825e1d08f7d1b192b960e5ba1be39fe520a1ec97f93982e1