Malicious PDF — malware analysis report

Static analysis result for SHA-256 9235559ebc94d580…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 21:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 573381380a3cee73bc7f1f8540fd11be SHA-1: 2dfb7fcd24064f52e71a4e5ea5d38bc869aebdaa SHA-256: 9235559ebc94d580077cf62f25717a51141a2ce7e307ea1b0e4d4ed52bfa7663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=adobe+photoshop+cc+crack+download PDF link annotation
    • http://phantasos.org/userfiles/file/91932767768.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8e74edcf0ef03423312a17f4608722fe/rataweb.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/89266830734.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/rezemumuwod.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/34733893721.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/demid.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///33222911807.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/19391593806.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/9564317765.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/diruwe.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/42968861259.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345c9a4e60c---72343685530.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2gl6ctqgg4ed60a9lnbe0f57ad/47186408785.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/42157265103.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/faxeratufebake.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091208173773499.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/faxolinewoweperonejajorid.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/wuguvifiviwaweme.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/10143743880.pdfIn PDF document text
    • http://sunway.me/uploads/file/160422319086.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/rutagezudu.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/repenijeziramafopure.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109140700471473.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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 10820 bytes
SHA-256: be4189075245a756a2380d3874cfc519fe19018d1dd2a379ff4ac7744c34f84c
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 18892 bytes
SHA-256: 89a270eecce02019bea17949daafb1fef478b6af2200e755473da093be0895f9