Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eec663be76a4b90…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 19:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 384e0186999549390798f19e13d9a7dd SHA-1: cfa197c7d68cb791593ed969355aed023600e343 SHA-256: 7eec663be76a4b908516e7cd59aacb83f0886d1d2c9d62859b51930f7b2a03a8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a malformed exploit stream and a link farm pointing to compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://antwerp-reefer-tournament.be/argt/files/81667641401.pdf In PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69277086280.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/lutaxi.pdfIn PDF document text
    • https://ever-progress.com/upload/files/vasuzabibaxisev.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d1839b4b---fubefasapirafizilopaw.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/namunodunadevatosewo.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/lunaz.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/73sggbm14vak67edh6i5u0ni04/gusafulabago.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95064682260.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/16623836763.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/96795083130.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1a814a4ba4b04890263c1d5024ac2462/rojet.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/lakebirekof.pdfIn PDF document text
    • http://minhanh.com/files/19578658507.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/53056872073.pdfIn PDF document text
    • https://12shio4.com/contents/files/mitekefi.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/poxugagarupanijusaribeto.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/78875616858.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/resuperijoro.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/65959198681.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/31046716181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mobdro+ad+freePDF 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_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 9972 bytes
SHA-256: b0fe4258b183970a7b05fffed66fe6542e75b39720fac65e036d512d6924c792
font_02_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 17500 bytes
SHA-256: 3db2f0f8c37a7184ff73c204484479dbd7723961a4628d423935904709c85610

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