Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aecc58b193539d…

MALICIOUS

PDF

103.4 KB Created: 2021-07-30 17:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a8d79458e4123232f421620e97e9e220 SHA-1: 7d51317aef3f9dcf75bd1f009baf67a57debb973 SHA-256: 67aecc58b193539d4c42a2af13d15eb88ded1abf37a92419769dc4d0557161d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=miniature+dachshund+puppies+tallahassee+fl PDF link annotation
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8378d54e---dunubonudududifimamibuxix.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/29lrn77tc699p40drpgbncn0ie/durexedasubagafu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/97805866169.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa74fde2f1b---16119097941.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7572ce0c---bixukilebunobif.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/31999245591.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/23919647621.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a315b55f65b.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kixekizigoremujarurop.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/mozelapubeworax.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e9370dd339fcb5eebd2e983cafd116ec/92968896028.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c04386d8460---3356907423.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9f4bffde0ebc7c136f6bfd34543775af/6266433910.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vevis.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52507518916.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t4l1ourgm5p7noruq74q2d0dj2/wezag.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210620080841.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/gafilisaxividuwuk.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/golimafobojuvex.pdfIn PDF document text
    • https://mmszke.hu/files/file/16246818647.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/51645e0a08dc2a69a6fb5ded12d60274/50319458945.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a07bef6a62d858b2b6d8a576d176ccc7/58676626667.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/nixejaza.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cab7c759c---lekazo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6024e6bff5366aae87ae99dfdd82fef0/selekopanowujudekojum.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_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 10688 bytes
SHA-256: 0d0aa0d54e0f35ac8a543c16bd6bc645d5db3c6c195f7fe660bdb6bad6bb75d2
font_02_sfnt_off00015dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCD 17880 bytes
SHA-256: 8ef243e4130202929be423d682451932ea05a7de567720a4e72d70d72784f1e8

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