Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e47fd41fae4fe…

MALICIOUS

PDF

59.6 KB Created: 2021-10-06 00:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 954b0205a952685054098406a0f29e4e SHA-1: 6862d76bf50854c976fc2c9e4d3887098874f18e SHA-256: 312e47fd41fae4fe4652aa4dcd00d5dee8d121f7d15c82790a509322839e3c94
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or SEO poisoning lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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://crysiq.ru/uplcv?utm_term=diseases+that+cause+seizures PDF link annotation
    • http://tehla.eu/userfiles/file/welajirubuzixi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615a12840cd28---18002308908.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/71430134079.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/nunagabasebub.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/suzabadirof.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2a5e24ed6ba3195c6291af18f5a599ee/48836325200.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/fafagabagox.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/24169828650.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/jadidorituteniwolewenebir.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/91258185568.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/39589259157.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84794865891.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d469f8cca9---jomifujamapelif.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/14793nmef8jq6431cahkhdhgr1/kozalotoro.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/vememakilotefo.pdfIn PDF document text
    • http://jmapilani.org/userfiles/file/fofivitevinojasef.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210929_57A449622A448F0C.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630764047.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/rajuranedafununawivekexo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/40022e1b6d5e8fcc8e2fee9f2003a708/xeguwixawemira.pdfIn PDF document text
    • http://446888.top/userfiles/file/24423528555.pdfIn PDF document text
    • http://palami.by/images/file/maviliziwogonuwotinufu.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/pajataxezuwotuvunijeme.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb151dc6---49113470685.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10216 bytes
SHA-256: a7b33b43f15f714945f42454801ee5d616e53e260973918da886798309d1147e

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