Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dee67be3b26fd3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 19:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3195d43da3a3d5de4d1ba62c3c69622 SHA-1: 72da13dff7a069e87c04bf565b2e44fea3aa4a31 SHA-256: f3dee67be3b26fd3fdea1cdf39fc286095b7de9af162a98038b1717b2cfedbcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=computer+related+full+form+pdf+file PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/11007576508.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0c3e9348d1265db1a78f890e5d0ee23a/33678430660.pdfIn PDF document text
    • http://zubrcup.by/files/files/boxir.pdfIn PDF document text
    • https://zagi.hr/files/fupavokifuminiwazopolawe.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/xeguvoz.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/wapaxi.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/mususujilafom.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jixitovuleregefekaniro.pdfIn PDF document text
    • https://ptogel2.com/contents/files/bapejugiwekutalevawam.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/5326199142.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/1431547212.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/16933480552.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/15368841406.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xususukikuda.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/93899515881.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/13430512712.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/82994719354.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/rokitine.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimuxuwutotudekizafi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/juxonovemegakumumeva.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kuwutowufagurezomil.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187b0e829b---tofovaloxoxud.pdfIn PDF document text
    • http://videocycling.info/files/file/tagexoxosug.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bd07452452cecc1af3c043e696e95cb4/66154073681.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/rabeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10516 bytes
SHA-256: 690308c68d6e807cd9ed01342a8599160deb3bbedb90cdbc94721b545744ec02
font_02_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 17288 bytes
SHA-256: d4ecd62a8b4395244010157fbb6d8e1fa592f11a4589958487a603266814d6e5

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