Malicious PDF — malware analysis report

Static analysis result for SHA-256 294267a85d12ac6a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 05:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cb3167b65a06e2ff8b6674a1df0c742 SHA-1: cfe5054f37f7565bb6382f9f047ab859f222fee9 SHA-256: 294267a85d12ac6ad7b7b24b4c0f257552f6bcf6aa432ff45d722c1c465b2506
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing structural elements indicative of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://zoltysnieg.pl/pliki_wyswig/files/1789143496.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/89865981435.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kojidukuzi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03b3d1d78f---tupurezazud.pdfIn PDF document text
    • http://3sdent.com/upload/files/29647603450.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0dd08e94---puniv.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/81065344130.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/nawejut.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/vegomimamupotadu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/64695401389.pdfIn PDF document text
    • http://mfahk.com/upload/files/29812319823.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/90d1642c1cf46ab53ccf41b8bd5c18aa/7139966428.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47d11d0ff---rebejuwan.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/41909278441.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vivisazesupafigepivo.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/sojakobobunim.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16079822075c8d---gukejef.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098969e235ba---69936934943.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/pisegomoxovar.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b31dda22ec26d4bc8d2b30f3574f1887/luderufufireseze.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/80b841ed25362ad0e9bcd68666f04b0e/28599099931.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abcaa9a8d73---nusebuzipos.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/88613677767.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/buzelak.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/bobesozisoxofude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=massive+mimo+fundamentals+and+system+designs+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_off0000bd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 11012 bytes
SHA-256: 7ab0caa8bb01a415284c2d3e679fea28c3b30377dee3037135e02126dc077fd6
font_02_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 16880 bytes
SHA-256: b84c026365602b2cec2d3b1e606af923cd523c13a929f71051d63a1b7c8ee98e

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