Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd97cbe139ebaad…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 04:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bf2a445b2b076e164cc4156b23de261 SHA-1: 5c918cb42cb9db95efe5d10e2b9ffd38e415e3b6 SHA-256: ecd97cbe139ebaad0a04f15a035d5a8b6f8c0b97d0bbe72a521275d68bad917d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure of a link farm on potentially malicious domains support the classification as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=download+cheat+swamp+attack PDF link annotation
    • https://arvikabc.com/images/uploadedimages/file/15530948062.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/15166748540.pdfIn PDF document text
    • http://chikatere.com/Upload/files/79957105380.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/25130853045.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/poxedalodefu.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/jagonupeve.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/futusawinosi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392991f76---kuzojilalubato.pdfIn PDF document text
    • https://2winit.com/Files/files/wivapusirozize.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/petawinixanul.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/84505927939.pdfIn PDF document text
    • http://plncse.hu/php_data/file/74751372008.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/irff4t03m3a7c53u7vp2gv0baa/tepiranazitakexaxikipot.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l04e9li74os735s0mmr8638kk1/wanivedumisitodab.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/6376048303.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f4ea36c2---gejebixejeb.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fadogin.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/resogamakiloburagire.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/topikurajoraveled.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/da6085cdc800bdb9e44c46cafae10597/vamejimizaxefonujula.pdfIn PDF document text
    • http://boldogelet.hu/media/ladirekajekewevi.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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10764 bytes
SHA-256: 6fd2fa257f32bad9718d010456e5f3d4b8740b2a403bf6625b0f18babdc269f8
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 18120 bytes
SHA-256: 0d88904d9fcc8b55b988af0ef4ebb317f170ea2b1ec0a941ad5c076a7ee2641d