Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6126c281e30198d…

MALICIOUS

PDF

79.9 KB Created: 2021-06-27 10:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6a8e2d3ebb5a4f42ebfb23c72b3ea18 SHA-1: 8c8cfa7cb4bb84e58ca4010dc80afb2aa958d698 SHA-256: c6126c281e30198d823824aa97dc4e5005924eb5b581c058363d370554d6a6c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/192ac510351e74a0146a09992dd4d492/fazizobifatinede.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd8d4d53525a49b204441bcdc8d220bf/41910179073.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094713d4285c---37164036206.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/536c5142422a911b3f6728d494780d7b/63338206056.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c49e71cdf86---wetabuke.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/sekinavuniwotepuk.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609269adbbbd8---76564679386.pdfIn PDF document text
    • http://teplospectr.ru/images/files/48102499833.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/volewemuziz.pdfIn PDF document text
    • http://centronegozi.com/public/kemig.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/am479uq5p78gfarigpepm8iubj/17520188391.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/77d7b0733fb8802c2a4cd335e9cf5934/getit.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/65912552127.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb11aa44db1---gufem.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889aa1304f---vefuv.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvma0pvrc9a52rncik1i4biqra/mupakesilif.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wedodobusizad.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/18ccb786971ff588cbce5a2de389fc88/momeratib.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/mamomigoravulara.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd8c115bca32595eb01f0781d71ccdd4/81611300339.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5193e3ba87---tinesilufebirugurijifejaz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9453733a---gezovobukalebenejofavi.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/taxabolegumozudujusufem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+plural+of+niecePDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10668 bytes
SHA-256: 0839e3870546fc2892ca9f80159455b78e55de755fa87a089a39135a1bcba0f1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 17548 bytes
SHA-256: 34caa2e715199248673b519374b03bdbecc6d9f0bf95ed641c54a6c68f234082
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1