Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9518ce435fb76fa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 17:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1c14570ed560672fc2a2665a31c19e0 SHA-1: 50f96c70bd815f730a404a6ede1a697e28d83c9a SHA-256: e9518ce435fb76fac229720ca767dd09de2c8835366d47fcfdd1eb12c84d7982
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=advice+for+seekers+spurgeon+pdf PDF link annotation
    • http://mu-rrrc.com/userfiles/file/63339495585.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/21447094547.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b78230f59---nanodonovezivotizezag.pdfIn PDF document text
    • http://labonscafe.com/userfiles/2903123137.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/pemigeredovezol.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zororoma.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2e64ce1f---nujixesifodiboradud.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23572724d5---71366153189.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/60605594064.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b139238c---96808800789.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/81869371757.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/61582958459.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210705004915.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_08_34_07_5977.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/wafinixibakitixaxiruf.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/sipipewinebawen.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f240899e4---74771071070.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bekiguxexuzowuxi.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/14971876420.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73109050859.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/larenod.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/99864689238.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/31965313620.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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10728 bytes
SHA-256: f3a426e77aa962d33e92cee42ddb5b9040e400b229f7bdf3e1e27d3e6e07199a
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 17184 bytes
SHA-256: 697f2218d9c62f49ac52753df289aadac42390d722ddc71ba31cab3c702b73ef
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1