Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f424e7191df691…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 13:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15665349460846a4f0adb46c5564ced0 SHA-1: 3548c73bca72c21613ecd29701383de9b0018209 SHA-256: 90f424e7191df69104aada6558b411731a5ce5e7f2576311000416afc8b79ddd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ilexgold.com/app/webroot/files/userfiles/files/19902435243.pdf In PDF document text
    • http://hanasushi6.com/uploads/files/22067862552.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbb6f8674d---69893504367.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/6326963685.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/71071300131.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e7476369b98e8d088eac55f9a3e487e/33294991335.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/88181380631.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210916052720.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/rakobusejirokowiromirofuv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a1e414c1---fowifedagi.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/90427432519.pdfIn PDF document text
    • http://electric-kernbichler.at/70630906274.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/gimabopepodutobodub.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/fonomi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/20607260327.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86306186424.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3134d3472---92789893419.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/89404164777.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/85908396157.pdfIn PDF document text
    • http://vodova51-53.cz/files/dexotagusosozipod.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/fipudofekaxekaliniron.pdfIn PDF document text
    • http://plise.org/userfiles/file/26670048861.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/67076351408.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25131338729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=app+para+escribir+en+fotos+androidPDF link annotation
    • 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_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 10688 bytes
SHA-256: 7894a2c7d0a82cac93d7d2f66e957b0d9ed60fd08324400531122ee1d4180768
font_01_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 18812 bytes
SHA-256: f4c014af04627af3fc400fd4bf198d95fa30af83ca8cb9425626ee6ccededc25
font_02_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1