Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7708cf2bcf057d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e841fe9351ade6fff4a46ffe179c0671 SHA-1: c64b3cfd728130bdf53318be0b5500ddcbeb2fbf SHA-256: 4c7708cf2bcf057d1afd785864860c9b1e5b9da788bf3340dc5adb1d607c0b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=software+reporter+tool+taking+up+cpu PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146064c49868---nubovenizo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/42738881183.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613118b718bfe---98102878509.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/14096363316.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/18061914488.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/68855940537.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/33635400263.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/mumozixuxixuzawelez.pdfIn PDF document text
    • https://photojet.net/userfiles/file/kefedasifapigogegalev.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/luderirem.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/pevisese.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/voxidod.pdfIn PDF document text
    • http://fpole.ru/sadm_files/22650627322.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/nogimanasaf.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/7547880869.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/52989381260.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fijomumarugavinone.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/bikikasur.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/43557170927.pdfIn PDF document text
    • http://polipack.ru/content/file/61009533654.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fd253eff25c6d6c20b5777f05a44f739/57895045988.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/45369992996.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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 10840 bytes
SHA-256: fe655628e539bf8c4645aa5c951d15dc5debe5b7868e8e7ee35ef5293b7aa869
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 17868 bytes
SHA-256: 812a3ea8c83575454692775e25d1a2a52c084e82e30b583a469d6dd2c8224772
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1