Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d7ec9ce9f5553…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 09:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9dd7eb213e9708ef5c074ecec2463cd SHA-1: 3aebcd06bca12469fbf4ba1e8dddeed22f64cfab SHA-256: 5b7d7ec9ce9f5553b4de5ae7005cbc50e77b673dae84d00a05771ec40c17717d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. These links appear to form a link farm, likely intended to redirect users to malicious content or phishing sites. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd56dfe0c---bazusuwaxosobipe.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/39144044743.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/42293433106.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ca027a33b5f2bf10dd2518623de9eff0/zusidopotugakexezef.pdfIn PDF document text
    • http://renovator.cz/files/file/91464136744.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/rowomado.pdfIn PDF document text
    • https://viehomes.com/upload/files/xonere.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9qbdh6e29m1brfsr40ojg13bi/fawubaziwoma.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/wavepalirowejenes.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851091d8c29---63171127668.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/vuvebulalokurewipaxe.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/28849835965.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184f7ba062f---62220784173.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn0hj4u9uh9f2uqfogevihvn91/turixoralazi.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sogizemipexe.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/31650359196.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lhvgbgs20uqksbpomil546ih1k/47991372681.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c351a76---75022933697.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3f70caadd---buxuzam.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/86707761898.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/72723722218.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7128b9e33---silavosimunojedawalexadev.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/gojukogivizoxazoro.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/dunoxelirafozibasatigi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd99881ae0f---70924550223.pdfIn PDF document text
    • https://tckontrola.hr/files/1875895851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tailor+sewing+machine+834+manual+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_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 16924 bytes
SHA-256: d9b1e08d68cd95baed8400a0d193dc639749929b14155836df068152e5633faf
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 11576 bytes
SHA-256: 6da3df6f4a519842ad41bd91a5e5c93bc47eaa635771a3d999d2cbdc4105b0af