Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5237d8b0e63877a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e26f68fbbd0c8a985cff68cd7b91d78c SHA-1: b8fbed6d7f3083808bce1f4869c5d3c8585721a5 SHA-256: c5237d8b0e63877a660c6eb1c0e9501acad789d97fd3ba62880f1ba5ec00569e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure suggests an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=principles+of+management+tripathi+pdf+free+download PDF link annotation
    • https://rieker-consulting.eu/files/file/2506519138.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/66757664959.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/1270403989.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/sumugawumokinufifuzu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612795872a442---68496581672.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cc89066455dc562a20d64c797a37f5c8/xunujujoxa.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/topunenowinanabow.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac13cca39---zisakamimak.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736879ac8b---23013348861.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/vavipukim.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9slv0s9bhm2cc7tsbq5a5dgn4p/tulipepid.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090342130e00---livemajepozuvedovajigo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095be41c9a2e---kidesip.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/piguxovejefilejixonuxow.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fe71d46773ff65e7ba10071492e52448/xikatavipozigodazuwow.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/88931696345.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/78954102391.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88522889324.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d00ef7fd9547e556b54948b4b1a32f0b/nuzevazum.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425976417---85802148971.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/jezavupusifusulelili.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/digitowanuvata.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/30586888641.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_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 11156 bytes
SHA-256: 0de739451efbfb2f81e291f22fe1cf3a8da83b643b46921e7691eee7c4c368ae
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17940 bytes
SHA-256: 24ad785189a7ea31a8910a29a6491998bb5c8475635159e615e6f2810f511409