Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cf47d22284daa2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 21:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e8e2f4cc942804c9d3e4cbd1c3da668 SHA-1: f4b3a4eafabc7e62d62a3744a2c063b82fd176cd SHA-256: 57cf47d22284daa2b1f9cd8b539119097c4e3d2fb0cee3b87169813128431e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://podarox.ru/public/files/xagemafetarunetuxakad.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o600itme1b1hvfpctgvp2im32l/pazug.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/43704897381.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc89ae7952---76339309345.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610967c129011---626823835.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/xajufonuzazitejajepafo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/etnap882iv429gevuj62mlbi96/luwodawategojelav.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/jokofigududur.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/fejoleniz.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38868866471.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c56bfe72c90---temabugipinogo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a88e8c76---wunoveripitel.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/morimologuxerobupuvixi.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26724072255.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b26c545e---nemad.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7d0d07a0---sodubaso.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/20761468087.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b03793781e1b997ede556a0b66019466/22848253484.pdfIn PDF document text
    • http://secretinvitation.net/images/files/jamebitufagiwog.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d16022ea---xusuko.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35798ba1f---goputosadexi.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/52712384008.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/16858329136.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/litovolubivikorasuk.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcca6fe44c2---pufetanowagate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hp+m12a+printer+specification+pdfPDF 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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10900 bytes
SHA-256: 74d9a6dad09fac302e8159b83599556db7d4cc6c95165e6238a84f5d317cee7a
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 17308 bytes
SHA-256: 9a395ded4b616f3a98a803fa31dbd4b6275c095452cdc5eb698f81cfb6747c8f
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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