Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13b2346e40f3531…

MALICIOUS

PDF

67.9 KB Created: 2021-09-12 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e35140aba8aedb4e3a92da6b06d29051 SHA-1: f69f81998357ecf68b47a8a9828d5807a173c52f SHA-256: b13b2346e40f3531070a098cdaee8d6dc0be5e0864cec6691892195c3ce51a83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, likely to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.gurgy.net/ckfinder/userfiles/files/81202515541.pdf In PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/48218247612.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/dirotizawizexiwa.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/zuvatuzokefimavesa.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/77187788313.pdfIn PDF document text
    • http://vejwun.cz/images/zasiwi.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/37992296153.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/wijemetodowolemofazezaj.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/93915504347.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ralisepujedamatamowupa.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2db0dc9abe6b6493695187e2ef0475ff/vetowenetavupimaxogunu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1dfda076---kojosajudivenagav.pdfIn PDF document text
    • https://samowar.ch/upload/file/tubas.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/90630414616.pdfIn PDF document text
    • http://slsnn.ru/content/files/makusirobizijobajirubusox.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/94164595224.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e362es5e2dioktghlpsc4u9ci5/kitomitanubafovepos.pdfIn PDF document text
    • http://caramelitos.sk/files/24064743886.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/sivejojuluk.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/40006305596.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/nuguruxedugek.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/61673722505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cast+from+phone+to+laptopPDF 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_off0000ae49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE49 14556 bytes
SHA-256: c6eaa77551bb03bf927b26f562d5308bd3136ec0317b7518c7642bbc3f86c859
font_01_sfnt_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 10560 bytes
SHA-256: 6827224b52d52ac98e3d260efe207e4bd24494fc845bb49b9ae819c06aa4aff9

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