Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be62ace04b3fb72…

MALICIOUS

PDF

92.9 KB Created: 2021-09-07 21:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9924f97bb27e84c674a729c3045a35e9 SHA-1: 6e0bcd72fef0f5a03e9c1991d5fc755b1309d903 SHA-256: 5be62ace04b3fb72912f9e7082244b89391904b7f26b1ff4f594df430dce8af4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. The presence of link farms on compromised CMS uploads is a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lib584p87ie6tvqcfov1uj5vom/tazepona.pdf In PDF document text
    • http://farmaciafoglia.eu/userfiles/files/75024610683.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78f078c42---kujotu.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/61050627843.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161048eb86c8e6---79237445601.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/70b7ec671d9b8058936ebfc7ad1452e8/lagij.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/29904000636.pdfIn PDF document text
    • http://iphysiology.ru/upload/sanosufero.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109221995095---95524033708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd122131ed---puzosemowigegax.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/08f521e4ba17625af6245235a7a1dcc8/65136992269.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae7474bd5---92449477262.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086149c5e336---woduzo.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31820433989.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24041f5ae---53671262263.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8d1a6aead3af4337a9892f7d84bc59f2/radakunajugadagiduletoxo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/80773354400.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77379b336f---vofiwuxagixuru.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273bbd4e5---wunekasakisatonexapajazel.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/029e2444d99338065b63bb9e89934f7b/34225123987.pdfIn PDF document text
    • http://charivne.info/images/file/legosireradakanadanavebub.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f05ae97d005---makiguvewa.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/16428320371.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611768a078e6b---bipulowuku.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/mezep.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/60495959959.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc9fa5e8d---xudum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+cognitive+behavioral+therapy+workbook+for+personality+disorders+pdfPDF 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_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16928 bytes
SHA-256: a92601962e58e99909f97e7873154f2a4d59840038f41be41d4c0aaff27ff564
font_01_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 11360 bytes
SHA-256: 7320482eae588ccd3698ed514e2fc655cef669a220a7e6d0b40ea0b5e53f64aa
font_02_sfnt_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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