Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2cedebc54ae693…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 11:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 453ba99b11863247c8064848ce8bb25c SHA-1: 95e7b7a7123925972a7b12c346821b32c86c3fa6 SHA-256: 0b2cedebc54ae693eee5d0fccb4e7ffd2c95e2664cad523c175f64414a918a60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for potentially malicious purposes. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=how+to+make+your+phone+a+camera+for+pc PDF link annotation
    • http://texmet.pl/userimages/file/dojevanuwijojukir.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tijudazafoxetenamezera.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/35933716069.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/70801929258.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/misofuxisil.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wagoxir.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/72341191386.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/ruvikubedewilozon.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78503912577.pdfIn PDF document text
    • https://kimcert.net/E/file/18087455140.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630702145.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qgpshc3edujjuv8pfp2puo7d48/wekaw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8pipba61nkcqs9s867d3kgfco/sorakugugifive.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/23870775515.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/52370134480.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/29944061168.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/tedesulefibanema.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/lajifepupaluj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345cce6f1d3---lotisitatujukawow.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/45588338204.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///90492476783.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/bifesewe.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10824 bytes
SHA-256: b5dd545367efcc77c537b6e037277b0b091bb3c382a88e3468ef12fc0d02da52
font_02_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 17696 bytes
SHA-256: c94e62df2692e9415a65ed625c88c3b9594ad0d5bb27219f65210515e5755b57