Malicious PDF — malware analysis report

Static analysis result for SHA-256 187e40fc62d39f22…

MALICIOUS

PDF

84.0 KB Created: 2021-07-07 02:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b1451d6ebaff5f7eba1198abbc04a8 SHA-1: d9d36ca8ee0bad7cc9d09ecec73fcaf8773711b3 SHA-256: 187e40fc62d39f22bd98a2cb4b2b71ca6ab6f1935fc96d7b9040c1b9a8e1e2b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Multiple heuristics indicate the PDF acts as a link farm, directing users to various compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pensiunea-escape.ro/ckfinder/userfiles/files/fanoferumux.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ea6075a6b45e2a6edd95d873259e37ec/gofowa.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fff54bb0e24dcc4160b481441c24ba5f/pefisifuj.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/31975534062.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/fufosexusugawojumavot.pdf
    • http://zae.me/datafiles/file/70898383933.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b950e815e0---93542447264.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/853ba726a1f61dca52594e46a8660def/87070816821.pdf
    • http://easternsheep.by/app/upload/file/turuluwurininunimogawak.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae3e22eff---75656205594.pdf
    • http://andlupa.com/userfiles/file/76070469654.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c77a52a4bbf---11991233931.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf032b8b830---tedezadapalidonerovo.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/58310f2776959a994b1bdb53cdaf13f3/jeladekakimafaroxikakad.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51337d331---zumevul.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210528161148060015lcvjsc.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/62977006046.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0b3c6bbe---tegoribigivakis.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c94412374---67861152137.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c85678ec---polafe.pdf
    • http://fixafilm.se/userfiles/file/38616754694.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf1c8c79f---waxogitosi.pdf
    • http://heizler.hu/files/file/93328623719.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=larry%27s+chainsaw+carvings
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16792 bytes
font_01_sfnt_off0000fdf9.bin
e811a42febfe2735c1f814515cd0fa0d1f740fd732a3b4e3395eb1360aa11216
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 17260 bytes
font_02_sfnt_off00012b3c.bin
061eece5f9325bbced5aafde31ade9e8ff179e5fc41a0b3def185c3a13ff69bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 10368 bytes