Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2f53b468a24653…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 14:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 537acd981a35db4adf2fa3ff5ade5c92 SHA-1: 0c3c79c23c100a4d92871c5f2ae633af84dc75cf SHA-256: bd2f53b468a24653e2a45077684aaf8ae776e62068b49ab91958af626749ffdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Furthermore, it features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download additional payloads. The presence of embedded JavaScript indicates a likely intent to exploit vulnerabilities or deliver further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613776895c9fa---vejitiku.pdf In PDF document text
    • http://mgtofubbq.com/uploads/files/voxowumikabomoguriguke.pdfIn PDF document text
    • http://ecole.ru/text/images/file/kuketuxipifigatijazanosiz.pdfIn PDF document text
    • http://cochemical.com/upload/files/duxafokitejex.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/niwulesuviravorenobaliwa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7256c053---mulaxokavara.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/gevaxuvepe.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/siliso.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/77089523899.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/lapuviminamubenafa.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/67827252589.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/4379897721.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/88626214017.pdfIn PDF document text
    • http://specialcats.nl/media/files/reregosewupezorir.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b28742e---54511535159.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/busigalexeliwili.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fanamufibonudizozafexid.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/wevonedevikafekodomezida.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dumanadureri.pdfIn PDF document text
    • https://jensbrode.de/files/file/5275655513.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/59881241729.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/sevuroxev.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rakuserimosekoxilo.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/nunitiwuboxajibuj.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nojisozuvejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+10+pro+price+in+nepal+2021PDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10848 bytes
SHA-256: a5e8649e9d205592d076a612e77a59111806fbc71770ef82013c1cb57f08e7d8
font_01_sfnt_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16672 bytes
SHA-256: c72cb5592a1576ade8198b42544cf9b73db3ec8287f3ab7744daaa7178903654
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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