Malicious PDF — malware analysis report

Static analysis result for SHA-256 590216ab6cd183e2…

MALICIOUS

PDF

80.1 KB Created: 2021-07-26 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f57d7a9c10a4e8fbabf3d5e7421e53b4 SHA-1: 90fa071c7c38cf92c06d1cab949dc39c7037e1da SHA-256: 590216ab6cd183e2b9b573c57247c3285b0e118e0c05c654f21b0a402595e5b7
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://angarakshaksecurity.com/userfiles/file/muwuxatap.pdf In PDF document text
    • http://linkipt.com/_UploadEditor/files/fudorixuwarufisanugibe.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/16422596323.pdfIn PDF document text
    • http://findplusltd.com/file/75932215996.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/wonutage.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/zalimikavulubovega.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/mitepejuwedurixumefope.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/dd21d59ba623a9b2f834378267edf0f3/nesifobaramale.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe82458ea4---vitazobukoluligonasoti.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/japatitavijinetezibebepug.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7cab40daddd3932eb325ad34060dd47f/89013706160.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/64af903ed0dfdfc749876b8fdc217519/42337903223.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c31cc059---suzibitujuvon.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00a73c8410---sutakiliwogosomojigomi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/778117e7b2f399d9b4d2f04e87678aa9/29641298064.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/37543355306.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ca02d533---rezizedizawotodikigelu.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0b0de39d5f3b13d883b2b781c29e991f/gepegapaveruxalomefe.pdfIn PDF document text
    • http://vgkbuilders.com/assets/files/58949170631.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceb38513b---zevelogegunuj.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/89190132651.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f1e137e90---nasaxir.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3475c848c---fovizabojibuv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2676c46f---jonisetik.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf98d9f01---51335166978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=accuracy+and+precision+worksheet+answer+key+chemistryPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 11108 bytes
SHA-256: 7e0fee3c724795e893a95fbb6bedbe09746d7c5016c774d30e7839dc4f63f81a
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 15988 bytes
SHA-256: 385634f342c67d95fd364b8c9f8135651aba3f0a163cfcd7e3959f81023991ad
font_02_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1