Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf43cfa3b1fc226…

MALICIOUS

PDF

88.3 KB Created: 2021-07-07 22:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4333103948c9b5fbd05c2617d88bc57 SHA-1: 9b9dd10f216540b18ef5a4688e6017de15fe082f SHA-256: 2cf43cfa3b1fc22685fedc6d7fc9d132cc23c12f1bf8fa53d61c5d576ce2bafd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zabawoke.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1bc9c6dc6---natobapazila.pdf
    • https://ferado.vn/userfiles/file/97683808321.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ba460287---zudevafe.pdf
    • http://ackerviewguesthouse.com/userfiles/file/dajisar.pdf
    • http://consulcongress.it/uploads/assets/file/13793490788.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb85dcc6ab8e068a33ce5d8481fc9730/67090170250.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97618a50f---91671526999.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7c82f4f5---zulutisodujekabuwetez.pdf
    • https://bd-sokolovska.eu/userfiles/file/lenigaziretozaxonazunu.pdf
    • http://kezmosas.hu/files/file/31339378513.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sisupopevixineliwu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/61092f1dafd9cd9de804cf45f6da44c5/zifilekarodojakizofuxum.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ee5ed7ec---bilokiruwilelujer.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/desavi.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/daa3139c3aab9c9c06ebd025dde54e3a/34090575487.pdf
    • http://ha-sine.com/d/files/rufitagufumaz.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/87318040633.pdf
    • http://birzebbugastpetersfc.com/files/file/kerezosagiposukiv.pdf
    • http://paillasse.hu/userfiles/file/79874051921.pdf
    • http://prestopc.it/upload/file/34632520232.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/56988022428.pdf
    • http://eko-inwest.eu/upload/file/61590101238.pdf
    • http://www.bluewhaleline.com/image/upload/File/rejugugepoxalofufimufo.pdf
    • http://rc-modeller.se/images/file///pifafuzovi.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69f341c1a11590750e629ddc64c8d0e8/kevivevefoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+level+in+minecraft+do+you+find+diamonds
    • 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_off0000eff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
font_01_sfnt_off0001080d.bin
c963b40dedbad99b73cc4145c665677ba1e33e72ecea0f5a18c796a4fc534479
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 11016 bytes
font_02_sfnt_off0001217e.bin
029aba235029cd0d0647b44b0c6bb8dba744d901b99643117c99d83715d5a380
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 19752 bytes