Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55792813cbc5e9d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 14:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66fb340d26823c12c989ddb31067956d SHA-1: 54b8ad3fa223cdf875993c52a8093b644b174b65 SHA-256: e55792813cbc5e9d6cc350693bfe20074fb5ff81f3dc19043c0b4a3146314d01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm intended to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=black+store+apk PDF link annotation
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/elbrutscqrmauoea09rdt9rno6/pufoxaruvawepitivulemomef.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fobedo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wefejolige.pdfIn PDF document text
    • https://citytrafik.nu/images/file/jikaxabate.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/bodesar.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/futusozan.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1974ho5oijfcfdl0tulsponog0/dekifu.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/33895680914.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/tefodeduxug.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • https://33mobility.net/uploads/files/87144614781.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jonafo.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/79082320909.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kc8dh712p0nbpe0s079lfd7j94/lizob.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/36781657278.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vatutabilalililopomojuf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/39ntd88v2pv7n20q2kmp07976r/futiluruk.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20865657216.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/48592886367.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/6562189202.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405407edaac---21362668659.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_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 16304 bytes
SHA-256: 7f986d0a26515921fdfb0e782bcc3b7321ecec7953e0273b0c1b868065c80e5f
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10316 bytes
SHA-256: 8d3b0df2afa4d7e48bae0558c9a925d1f1d3c4ff82ef58a8ddeca603295166ee