Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eaf7b231527703…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 09:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04c7ba8b70f6e09f1daeddce6872863c SHA-1: 4902dc237fc418358dae93bd6c72b9443cf500be SHA-256: 33eaf7b2315277034b62067b0f5e36d1f9ebf86592f5ba07bb2c888d1a7fbca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=descriptive+survey+thesis+pdf PDF link annotation
    • http://yilip.net/userData/board/file/paputinidatedada.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f166ae080ce---xezosigexixigo.pdfIn PDF document text
    • https://soechi.id/userfiles/file/9879959605.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5cdd95997f1108543a7c35267697bdf9/xufojowoxezowumodof.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/44568132317.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zekexino.pdfIn PDF document text
    • https://baglab.pl/galeria/file/96936080247.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/30259198113.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/18872152415.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/28763705253.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36ec3c9e0---purutanakilawizikodaronu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/83158740967.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1e8f4d2---nadeveravosarobupineme.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tazatexofuxuvoro.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/7461841860fb75f91d51b.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/memiwaruxexijef.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/4108014992.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/19105534327.pdfIn PDF document text
    • https://avenue102.com/uploads/file/25098978684.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/82278685469.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/47211228537.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/06868e936d58395699eb715256540b4e/guvotenigufozexubafokaf.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13510e956---ruvabalajeke.pdfIn PDF document text
    • 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_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 10568 bytes
SHA-256: dcf2bb115bd3e6a2512547ab477945168b462419880778522e46957c762f2cf4
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 18016 bytes
SHA-256: 9a195afc9e27626e33653b52257598e8a48efc902065c4291239d4628f1198c7

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