Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a66659a5094b7e4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 11:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 191456abf51cd726156022335060a991 SHA-1: 74168a3f79f52318563dedbb00da3679c8420e5e SHA-256: 6a66659a5094b7e49a7e8bc812af3dc769fb588fe0bd498ab8f3b5a465e0ba83
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2502924c5e9af4346845ec1b73d9d6ef/70109582752.pdf In PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/17988055591.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/38108883630.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/27067717829.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/sibaxax.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5heqrm96rjlkmsvdlml20l3l4b/16463702243.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e66ba988c2---vosilek.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0af65c707458daea9e8044e77cf5ad1e/42552574482.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89620ce272---puvit.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jugodoloruzasigitefatafav.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ebc3651c83ba513917067790e971afa7/pumukezeleruxuxu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c66ca732547167655cd51b9ff593d7a5/97703650047.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079f38e6ddba---bikubixizad.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/kieo0ffl6ess9sgtdk5p2e1omh/57740002529.pdfIn PDF document text
    • https://la-klamm.org/Files/files/98119902701.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398b350d57---ripotovowasak.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/15a67ec3dfa66abd874c6aeb3c10391a/xavewanasubenuxif.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/93170641594.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5g11oav4ccsp41tiiju8d9og72/gunor.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8588c360d26f0ab2f8ecd050231c1d16/vekenif.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5b9fe376b---rebamez.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/80712832954.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/11780532116.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/21714264936.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/vaxirivoxatusakojolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+about+ghanaPDF link annotation
    • 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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 18568 bytes
SHA-256: dd0b4928456937a86baad3ea371ee36b6bd1cda919fb51838722e2e6266bf8a3
font_02_sfnt_off000128fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FA 10116 bytes
SHA-256: 32dab01c2e92442076e40c26605f1f24babd261672120005b002c46b99baeb1d