Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62dc3eccf4358ef…

MALICIOUS

PDF

130.9 KB Created: 2021-07-01 09:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dfc7c62e24152173e02474cbe92f922 SHA-1: de7eade8287f0a58dad1c454529924e6bec2162c SHA-256: f62dc3eccf4358efc3bdbfc953511af8dc854b219850edf177beed851413c8f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=mock+button+placket+meaning
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aae57cb095e---jubizalevo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a038e7db96---3561448967.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/abd0c65e0918b57770caf189adcf170e/30736987966.pdf
    • https://efnnma.org/files/file/16627481783.pdf
    • http://flexa.cz/docs/file/nalenagidaxuxezulizefum.pdf
    • http://tandartsindex.nl/images/uploads/nusejukejelarexinogapifu.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3205e78---rasajoselofitosiver.pdf
    • http://fitviewer.biz/files/file/473380474.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dd5a36b5558a8ccced7a4ec1b6fdd431/vajejijewurak.pdf
    • https://susta.vn/userfiles/file/tukisif.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e6f4fffa---99474540735.pdf
    • https://dolaodong.com/userfiles/file/mapipidalisadixotoxulal.pdf
    • https://ebooksweb.net/files/file/19889585750.pdf
    • http://www.bandungmesin.com/file/90553468165.pdf
    • https://sluganarodu.org/userfiles/files/fodexoxapexos.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/wijekejatobofetof.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9ebdf25ba8f4a0cbeedab68739ea44a6/76018133945.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c583edca80---77349475840.pdf
    • http://pusancard.com/userData/board/file/bozimuzizexa.pdf
    • http://gramercygrand.ru/files/file/titimetir.pdf
    • http://jnnycc.org/userfiles/file/92298968171.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c096d2ef54---74739999775.pdf
    • http://otoozevran.com/resimler/files/92519364438.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bb7c6a0a70d44f4367aedaac39f32b8/34827584014.pdf
    • 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_off0001899e.bin
267ac473f78fd7aa3d433c5e743f3bd4ac788570a5bd120d7742422e95e8f572
pdf-font-stream PDF embedded font (sfnt) at offset 0x1899E 35004 bytes
font_01_sfnt_off0001cdb3.bin
3fb8ec163eede4224f0a207e72746cdbf3ba7112d360fabd685e3da3032cf40a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDB3 10772 bytes
font_02_sfnt_off0001e643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E643 16792 bytes