Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2a1f9b7fe515cc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 19:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a0f8c39e2220dae30712932c5ac3351 SHA-1: 7bc8f03930e9594dd0543488d60b388402baeb67 SHA-256: 8a2a1f9b7fe515cc28282408ce761ff53c8f990836c7a6ee81dd3caaa453bbb8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9028

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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=access+sim+card+android PDF link annotation
    • http://ongxoanhdpe.vn/upload/files/71157542554.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/11145965307.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fdf9d95b489ee89b124d12b61214c461/bokomiguxeliwus.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wagoxir.pdfIn PDF document text
    • https://successalpha.team/upload/files/27961327766.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/64339311636.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/86732804433.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sizefamugowubovodi.pdfIn PDF document text
    • http://besteva.com/upload/files/92461371252.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/diwazog.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/29720389237.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/disewabekapodowuzeben.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/14366400250.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/77583323337.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea3f65453---92015204194.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14a886e93fa2c018470f8d95d56bb853/14323721608.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161340fe533656---dunodutamofogobe.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/jazatusajataxut.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/jekufebuzunipuduf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10368 bytes
SHA-256: 60710dfea6284ab6ed553b468f0d3ca81617e4e4e62916d60cc636029bc28c10

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