Malicious PDF — malware analysis report

Static analysis result for SHA-256 6000d91abaf879a7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 23:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a469b5f07b1799c21808ed24ee7a9b79 SHA-1: 67f927ec49b18b67b8df9bea3424208ffb7093b8 SHA-256: 6000d91abaf879a7bd5aa676af84e2e762681b9440a425d83da103d2ed3804cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also includes numerous external URIs, many of which point to link farms on potentially disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://digitalpolicycouncil.org/imagenes/file/13833906285.pdf
    • http://kiapelhrimov.cz/UserFiles/File/digas.pdf
    • http://nowyhotelik.pl/userfiles/file/43252273257.pdf
    • https://gentrilieu.vn/userfiles/file/26409728476.pdf
    • http://usairsprings.com/userfiles/file/24400615064.pdf
    • http://campingwithconvenience.com/files/files/wefiduwoberur.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/sogexanubolugumo.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/55106545472.pdf
    • https://pankajplast.com/ckfinder/userfiles/files/wenaf.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/karixa.pdf
    • http://computergramm.com/userfiles/file/josekuret.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/26485836197.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c63181609ec8efae8e1aa5ce41a02249/3759067771.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/53597296537.pdf
    • http://pwmtqatar.net/userfiles/file/51725165502.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/04c144118d2a9a6e38074feb4a05be3f/20200631712.pdf
    • http://sbstroy53.ru/img/files/kusireji.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/kser8a64h5nr3s6dn9voje80fj/sosuxeb.pdf
    • http://mamolenasnc.it/userfiles/files/doveduxo.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a5af276---9342175787.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/99b746cadeb3001d51c61f43efd76c10/bixizebedimagiz.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/93054266806.pdf
    • http://myredm.ru/uploads/file/bezepasupigadokepuwagex.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/73168465336.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/61399789369.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=streaming+boku+no+hero+academia+heroes+rising
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b132.bin
b6671b413e4197bbf196899b69da1cfece79b13e6b6fd6f4997d06581c257897
pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16188 bytes
font_01_sfnt_off0000da21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
font_02_sfnt_off0000f238.bin
59145655d1a7619c5812be28d0090131908209ebb19f3ae213868be4d395ec4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 11176 bytes