Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d12d02b50c2372…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72eb02c6bc67a632bab89db76899feb8 SHA-1: f19db5e0c9825a90c95845d27b3b4d5ab475e6bd SHA-256: 93d12d02b50c2372e6b7db5ee6d631885f2e29d2b9c88541dbff8c281e306cd3
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6342

Heuristics 5

  • 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
  • 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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a30b4f7f5ee3c668c79cc4e11f003383/6730255056.pdf In PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/kifavomoridabipapes.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984af5e15f9---75664812250.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6a3dfaddfc3100cd32b5b2b68ef50c7d/95877433010.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8afebd44dff9f33b7623c2a0fd650ba9/17870383164.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/pefikurenakoxobidibago.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/juwokuvimaneta.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/35959080309.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/kiluwunopikiligekirurub.pdfIn PDF document text
    • http://surausa.com/uploads/files/59161871146.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/43793104450.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51108f79---sezigubudakozokinalanuper.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nutabezirodetufiwol.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3571197f725107829b4d206112b6550/38338773244.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/99343513702.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/minategigeguwujurokodekal.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/93096433912.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4d1585b50f998386b630aa9e5e521b27/82516608899.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/62783734653.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8e748f05---giwod.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fejoje.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/janewux.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/92c294433425e10a18c6e00ef7647262/wamed.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f5428a90b4ebf698d01b2728617e9d52/3724448179.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0c46f864---73278385878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=il+fu+mattia+pascal+riassunto+capitoli+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 18156 bytes
SHA-256: a96c6d5fe903bb9ac193109c86944967cd0f13d70c5274890ccc0b1e02125261
font_01_sfnt_off00016a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A92 10700 bytes
SHA-256: 817e0153d1b91d2c028c7f866045d60fa755e411eacf064eae7a4cdfa83f07de