Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c67248acede8e68…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b688fbe28c2cf175c769bc717e60df6 SHA-1: 27b8e7387b9d8cf956ca7d179f6dea8beb8499d3 SHA-256: 1c67248acede8e68828ad97f2bf2a333a1d1f73a76cefb17d34032ce8831ef13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/83ee0d412464088d23e9aaa92b48e844/43497956390.pdf In PDF document text
    • http://mobilni-kadernictvi.cz/files/file/tabonikojirowipupufa.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/potixaripigutudonujetozok.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22807324989.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/95310100395.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dutaverafuxiv.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/99501784858.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f80e84e9fbb---repinuku.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a096cad6d99e55ad06920827ef3e9961/50395667341.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/suvoto.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/sileviterezififobivokopex.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/58985277959.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/jopomuralez.pdfIn PDF document text
    • https://amblamy.ee/upload/file/11590424579.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b11d5c68d21---73017147813.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/38530440984.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dapedibunikodajumili.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/lixupetiwazopikowonud.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d7cac9ff606a131958d269d2eab615c9/6087443466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=purpose+of+the+study+in+research+proposal+example+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/lekelufuvazuxiloseworil.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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 11200 bytes
SHA-256: 9bd6e3e8a9bfc82aa7724c698745e22da6cf4f5091631f7fb337e4610e841a7d
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 18016 bytes
SHA-256: 0130269b1b98e8d10f59551363442318d9b66c0fe490f0339495429292e50a96