Malicious PDF — malware analysis report

Static analysis result for SHA-256 550ef9f8cae16868…

MALICIOUS

PDF

138.6 KB Created: 2021-06-25 12:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d9d4ddc60db77b842dbdeef3d43556b6 SHA-1: b411fc2bf1575cf29f303f9a43b011c7011f1c68 SHA-256: 550ef9f8cae168685c891a035543420aa0d51c81ada2406e555e755d3065a345
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=fnaf+2+animatronic+in+office+sound PDF link annotation
    • http://porpora.info/imagenes/imagenes_contenidos///50619133275.pdfIn PDF document text
    • http://amandamaitland.com/images/file/48047919229.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0638d352---81731545241.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/fusabovofugobepabuvewu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da5a3f0e3---baponupokenewevugobow.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e32b2320---4884269987.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/sagufewuduvitimuj.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/6278353141.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d027a33335---98912219499.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1m36hs1m4gg3teijq8v0avip3j/guvekatetavunesozijiz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc535ea598---rixubonujemujowokul.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/63713587564.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kipetogadop.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/66993989124.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6on62jf1c8m44t8h6qtpfbqk7d/wiranakad.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A91E 18944 bytes
SHA-256: bcfc99ea59132a1f6b98620101c241be6847e8167c438c5d02482f478e7572cd
font_01_sfnt_off0001db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB3C 4540 bytes
SHA-256: f8d3ea66f75802e3caba8e2760981ffe6c7bc68e16ae97704a151b8a785c344b
font_02_sfnt_off0001ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBFC 10788 bytes
SHA-256: 849f7e9452e9472216f91df0700ccfeb84085a797ddfd102e0e80bb5142592ae
font_03_sfnt_off000204e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1