Malicious PDF — malware analysis report

Static analysis result for SHA-256 9706495c007580b5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 06:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed8b8b9ae7657b233cc6936efcc1e2d0 SHA-1: bf90047b24f86a528754017ce42fafb2ae4ee571 SHA-256: 9706495c007580b5ff09a4e9e3369704c3493a07811a246c43153192bb9b2ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=most+popular+pattern+lock PDF link annotation
    • http://lpxs168.com/filespath/files/20210905224641.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/74708217491.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/pelidegojejilofe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2652d050a---85604106167.pdfIn PDF document text
    • https://fasleh.net/Files/files/bezebu.pdfIn PDF document text
    • http://glassick.com/userfiles/file/funogiri.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8cd238a17---69691576511.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/29493361095.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cj9bl3nfj7pndefg2inm023pl5/fafona.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/67621775256.pdfIn PDF document text
    • http://ndt-ultratech.com/files/7863478634.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/xexud.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911221508263008.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/34142593497.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/gefimumisefutuvu.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/vororajiramejirolig.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/36868574072.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1c9d5022e844791100f636a41b5913b3/46789765176.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/84694647010.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907140320554442.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/famuzedudefevar.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xijiliminazerulevij.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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 10460 bytes
SHA-256: 0f7d6a9e043ed8f7f72b69f78e1f9f10aa73ce2871d2b324c27b71f2b1aca203
font_01_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16820 bytes
SHA-256: 243367a92b08b41ce0622b923f325ce9d6c468925837a74a7d0c9518d700ff86
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1