Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93499281ac52cca…

MALICIOUS

PDF

78.6 KB Created: 2021-08-13 14:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0983bc6c912aecbd46e895715bc950e2 SHA-1: 8b3e5d42dc719924c8f9d1745be3428e9ef5a5a0 SHA-256: a93499281ac52cca613fcf878cbc6c1c24aeaf62a3ccaa95a746782cdf768321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c6af396dc2b539992ae01f93eb8c6f5a/66055625203.pdf, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39945923453.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160847e3cac84f---mosasafoned.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63286e91b---zesemumorinibag.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c6af396dc2b539992ae01f93eb8c6f5a/66055625203.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/59686430258.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab0761081---73652469264.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608960e1aa80b---80693896242.pdfIn PDF document text
    • http://klpa.net/userData/board/file/66733140999.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f031f283---dagufuvet.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/87093451467.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/pojonefekus.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/sejufetunosavagosafajijom.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nisuwured.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac452ffe3---rexamomasofusozubirimajan.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/64236519478.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/78160553464.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/jonebawi.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/zifejovorelawipijo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/24310700782.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/razonilavimexelegunevajo.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/73228173525.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/43870320038.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1878267515---fomazumes.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1b154761dcf8d127463c66b8bf6f144c/27606250916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ejemplos+de+resolucion+de+problemas+de+adicion+y+sustraccionPDF 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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 17200 bytes
SHA-256: 50edbc741cd8ad2536608e79f79324d64a0b3f2204b0bfc10df5df3ae81dcd92
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 11144 bytes
SHA-256: 98b6661bf82a854843d1c44af7d16fd15d2e863c779a56d31c54202c910c9399