Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04a6518cbf05b4b…

MALICIOUS

PDF

87.7 KB Created: 2021-08-17 14:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1a8981171f98da98456ea2f8812eaead SHA-1: edfe9e33b4d8527d756551bbe6332c86bfe84dc5 SHA-256: d04a6518cbf05b4b6942398abfd707734208d27af49781a59b7b39d92c782c1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

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://bnbtravels.com/ckfinder/userfiles/files/86733008144.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd7beb89b---rajat.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d562e5c1f3539a414b84d94c73fa6d61/17984392964.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/oa795eo69argpost8pnht0bvv5/76719711305.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rafopurasolebeputa.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qak6audnb4kolns2edgs75pbt6/xitalusejobodinidax.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/45420030977.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kesawoguturidikokaseju.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1852b15573---tojuzijunisujitoj.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc4312549---80273943229.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/80076893370.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5bf26ce9cea9405a3f231108e283e0b1/8415871668.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vibopojukodituvosi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/namujonurafufuge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1750140df---ripikamijamuji.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b2c32bd6acc627cb38f180018b5822cd/gidimujadozip.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/47081124133.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015dbca724---kabilikaju.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72531466233.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/38863634247.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/90205718322.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20ca1c837---35054082196.pdfIn PDF document text
    • http://orrizon.ru/images/file/wuxoraxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hamilton+beach+toaster+oven+chicken+wingsPDF link annotation
    • 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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 11052 bytes
SHA-256: 3eb4d22f4f8dee87b65dc34e7a2070aa7a0001ac8c166fcab6bfede7bcfd0f2b
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 17472 bytes
SHA-256: f8ac83f2b1f7380cf20a49a97c02043a99cc98dcaeb74bc4379802a3a63c84cd
font_02_sfnt_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1