Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c6ed6af78aef2d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 10:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7da2db562404a9c765085a83c862ec64 SHA-1: 85ce637ee710eba2d866b71b318724ba28106fba SHA-256: 37c6ed6af78aef2db0f1233f5a235df815432c41f730bd0183c9847f35ebed42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=librarian+and+archivist PDF link annotation
    • http://weddingdiy.cc/uploadfiles/files/20210603_110108_1182.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5d812f33ed613ba4b90b74b5dd932df2/feneful.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/mezufupulubemisedixor.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/newenidofufimo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/sowejililezitixuxewalukak.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e569dda0---nexoxamujevamojawiwelotaw.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/worijididutotopor.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/tabobog.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929d87ebfdc28520cc60610d1bb86da3/86710371127.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/f42d939c9f312055bcd6705318525a00/8400239615.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/7acb685abfb1b20a04f09ae846de2ddf/22713165827.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161003cd08a7f3---81665184299.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/22158001499.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90cb6ea4aca1d0567c65552733f7b2c3/3284380482.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbec44aba4---febosema.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/99613585577.pdfIn PDF document text
    • http://9jamail.com/userfiles/file/93422370818.pdfIn PDF document text
    • http://boldogelet.hu/media/solevuwuvugimenejivegik.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hjlcehretie623si0e9aqr9lp6/tanurapixoxusopemuje.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/96f3d18f62531f799ade2f51e637c143/80045752181.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dikivofegedebusafemigo.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 10332 bytes
SHA-256: 7cf6550580e31fcc21f785e5e70c93daf5f417aec566bf4012e5cd98c504c462
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17676 bytes
SHA-256: 5d9b91f3de0e08e2c5bc96028976d1828860766868d7f391e9a3b7e13762f4b0

Open this report in the interactive analyzer, or submit your own file for analysis.