Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2fe40ebf65426a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 04:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57193613d9b6fbcbdb00ebd9b8e56345 SHA-1: 5022698bc75d647422b8c2fff369e8394d1b18a2 SHA-256: ec2fe40ebf65426a891ab1598630e5a789cd7e571ad2663b8820c3f1d8979fa6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests an attempt to obscure the final destination and potentially distribute malware or conduct phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4edebcadf---35542718172.pdf In PDF document text
    • http://nanoservice.cz/upload/file/nunamefuf.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/48672797189.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/32386280997.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6996550350044b9a073ce5ff588dac18/bimevexemo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/67378208889.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/vutasujijofaw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab321c843---niropufirojaz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e1e7ca072a19e4a6bf36d2359b093372/77585491536.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/51898082588.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/vugupelebeb.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/rozikusewulugumurizise.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/9478015496.pdfIn PDF document text
    • https://drlanda.hu/user/file/mebowikujevikuromer.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/vomujisiveliwukusososuj.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a48e007017150a460202e22f6c983451/futafesedanek.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/69972087352.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210904_27A26934D9F9E82D.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/3706151375.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/xigazamuvelun.pdfIn PDF document text
    • https://costarica4d.com/contents/files/29063929325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=giamarchi+quantum+physics+in+one+dimensionPDF 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_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 20416 bytes
SHA-256: 549340686f7b5f04770c61f38601c4e3b86a7761fcd057960ffdef8e78545806
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 11132 bytes
SHA-256: a7cd6bc83293fb3e3e283a0d3baed39bee78e7887831df94d6e706be1a4767dc
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1