Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1373bd85cc6e2f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a5ad64cfdc9cbe824d032ec9332296f SHA-1: 3da7fc290a04a820cf6a47115e24b176d0ab5e8f SHA-256: 6c1373bd85cc6e2f1ee4948018e747ff7248441ac4c303f41a58fe11169257d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm for phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=close+enough+watch+online+free PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae8f0ff62---61955862215.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nipozixavuridoxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da38619f---ximulexopadidutuman.pdfIn PDF document text
    • https://campermagazine.tv/public/file/folelozaf.pdfIn PDF document text
    • http://simoncaulkin.com/images/62799937506.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/rowefawafusegirozaderaz.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52419014657.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416618c580c---11226259906.pdfIn PDF document text
    • http://riviera.az/userfiles/file/69457082353.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bozitixa.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/37870320370.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/68013806176.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zumabuwaboki.pdfIn PDF document text
    • https://norservis.info/files/files/25599681432.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/bomevirapaf.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/31724801003.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/dutivofateriti.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/72529741507.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xomiwazuwezaw.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/rixaba.pdfIn PDF document text
    • https://olterus.info/contents/files/45349486536.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/39246605291.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/rugilubi.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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 10832 bytes
SHA-256: e31b6e042ea94fe5faf0ece89b7556f8970316953b5aefd884a983895ce85ba8
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 17844 bytes
SHA-256: a5655703d5b5896d02417bc9ce2eb1b09168757e861f815c2fbf32145a6f7305
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1