Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1c1be6f073f109…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 05:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aabed90768682d58249e5b6da0704745 SHA-1: bb0dab4f85a59fc770ea051e6777f65cd7929aa0 SHA-256: cf1c1be6f073f1095568af1a05958c9397be06b014e27945a435af0286a571f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as 'https://nomylo.ru/uplcv?utm_term=redmi+note+9+pro+max+features+and+price+in+nepal'. The presence of external URI heuristics and compromised CMS upload links suggests an attempt to distribute malware or phish for credentials through these redirected sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=redmi+note+9+pro+max+features+and+price+in+nepal PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d8046a1cac1c6ffc3bf7aa255a76a89/94574082369.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/zasuvej.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613362790fd1b---41843144055.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f46dbcc478709176ace413cb39334c73/newibadojojenesune.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/fadidagojokeso.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/10360612435.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/92843370786.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/24522440707.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/vifarolowukekesubenu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xobopawanipubariwenatuzu.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/25406091186.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/8894805871.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5aa819a8---lilov.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/64239022789.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/60358823723.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/fejolewiverapaja.pdfIn PDF document text
    • http://chinalabware.es/d/files/85296850237.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/83248813506.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1ac191137---75825234388.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/77983286721.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jesoxileradekuwitelan.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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 19196 bytes
SHA-256: bcd44dd008156d9e04db7fce468303fa8a92bbfb9ee1b677ca9d73c8ea42ae63
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 11196 bytes
SHA-256: d9f5682fe26710860f7041fabd39049b0e3c111dfd5fc1c45df9710132921394