Malicious PDF — malware analysis report

Static analysis result for SHA-256 f309d33af99fc67c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 15:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09dc7be1e7750fd2783f6613bc9d0e19 SHA-1: 694f312f91c9ad9d8b5e97145d9ec6765281b07f SHA-256: f309d33af99fc67c8c31c7063395bda1dc6e57116dd7de1d67438b0cc65393e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files hosted on potentially compromised websites or disposable domains, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent, likely to deliver a phishing page or a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://chcial.ru/uplcv?utm_term=love+ni+bhavai+full+movie+download+720p PDF link annotation
    • http://lindendirect.com/tempimg/file/84340954694.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210908232107388974.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/xoxubasagapisezopeganewe.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/57668992911.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/84143130137.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/jeperakagu.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/daneza.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/majegugisojasabal.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/43430131710.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136822759930---26714592371.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jorepobipa.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/vuvunapusezamuvajakari.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/metemanomikusenizuge.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/34475185731.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1952065ba503523bfcda6f40813bffe/suwedewokegukon.pdfIn PDF document text
    • http://specimport.by/files/files/fapijetuzuzuj.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/88510436659.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/23720743028.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/zaseruzunosevurikubedelel.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343ee0468ff---65496497007.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/milixirixigixeronomap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161339dcd52868---mezuril.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f39db65ff---bumil.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hl65h9l98370cj1pmhlststge4/97306794651.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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 11036 bytes
SHA-256: 336a5ce75bbb0bd5a4d8b5e3c12b84432137e6940249d8c476cfd87c8d95442d
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 17908 bytes
SHA-256: 15ac30b166fcce89c81e34471c9fd4fc5cb9162bb1e7ca18ade860eeaf0dcb28

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