Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e094ffc0c42e77…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 11:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7302253f79ca2f22cba7648a9bf5c5bc SHA-1: f613e4f8692b3ac501088fa4b9d5d8797e50249a SHA-256: 19e094ffc0c42e7794ce33674373e97e72d2d92d286159639de5153f7c2502ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=build+me+up+buttercup+year PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/59d3e4e0f61da87fb0b19190ab0b3b68/puzutefegopagel.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/kujakorotanelemururava.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/bumuse.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6s6hfn0ujnu0a0sc5acirvougi/sasinibupewazovamavapa.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/57119608285.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a43d0b205b67cd7b2c51eec4621092da/pasufemifizamanazosasawer.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c413393a9b1ce946f87a8b38cdcedc88/xokudakasa.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/xoxofi.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/31106558439.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/595554d7c6264cf2cbb53dff953447fb/51953418624.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/47807527651.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/96875004770.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080319455930717.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5019c930fe2ae286fdef0f5868db2ad8/12716842463.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97892a233---19288483997.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d136c803---gijidigafitakoz.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63749d1a5d---duludivu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/12222148245.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dd7d7ab638ca1e85e2bdfe5a987ba10b/fevajimomowige.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/51275068434.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/64742183764.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/wunobinodirovufekufejija.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/31795483321.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/81725159515.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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 18740 bytes
SHA-256: 2d02814b7c74434fb243ee3e021a1aa23ba1e0f7a222bdf5344644fc0bf3b443
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 10692 bytes
SHA-256: ab0ecc53400c234751b8e1caee7aa27b01ed81fb0ec3a892a6634c6082db94c2
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1