Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0f9e461951c5c2…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 07:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 188379fe32f3d78f1da7b90f219a0fbb SHA-1: 809d11f5568487027436603e56b22e7274f25151 SHA-256: 4e0f9e461951c5c2a950e5bc24d49085ffa1856aa3a42e04ac47982696e85599
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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=lavern+baker+gimme+a+pigfoot PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a1423652---24585232006.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88068708b3---51748840758.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbf933f102---mojewoziwulonuba.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0f24ac3bf134b5cce323dd2d746cb92b/99582924446.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/78ea1798e29367d607b90848a1f0737d/juzixejurapakigitu.pdfIn PDF document text
    • http://armanetti.com/images/70198876057.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/cc9914d4563a54e9638c802f0067d9fb/77175247943.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31e74aeeee---betarenonazitobokotuvax.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1957c9d366830871e667083315e677b5/jokuwitosunagem.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/27710532609.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/44290691561.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4cea8c42---goxelumimode.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dd8a84562---xeluwagivutof.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/36437362116.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1131807fb---jepitomemedazar.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dakavodokajosogofifiriba.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d3242eb5---96552457001.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nekirapun.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/kojapazenitesemopo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sstovencmb9r0b8qn3vmv635k7/86746291899.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0ldu8pmpgeplpafffs2jkmu6hi/sufimip.pdfIn PDF document text
    • https://aspirans.com/files/file/gixapikugomobafafipagomo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/32447352341.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160840be4da40f---warapagekejisafixomijoje.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/83838789406.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_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 18536 bytes
SHA-256: a9ea9b1b775995e6ad915acac58c15c076618cc91d0da2e72b78af54fdaabd78
font_01_sfnt_off00013610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13610 10740 bytes
SHA-256: 1817752a9b994bea49a81201cd04c49caf2492838e95d3b32df2b8f907480544
font_02_sfnt_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1