Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d32b784c2f63c8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 06:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41b286d0f3f539879a2b3b7c28585017 SHA-1: 081feabf5342066b7be2cc47cbb7a1d277a9abdf SHA-256: d6d32b784c2f63c8171b0382e3e0c764fd5048b8cb156365593fb2e27b0e30fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of suspicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11086238176131877bc2d62.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dad429378---dikan.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/19691647919.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/misimafumetusegude.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/fivelamesed.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/nenazalijedomaludemiza.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_8EE468C87C1FB30C.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2099684bb490fa9e118551312f518086/texoz.pdfIn PDF document text
    • http://jfe.hk/userfiles/wavugoviminarumug.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/7947471815.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/rujifetukeriseserigusu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109030345421893.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf19b3164a---zirerexa.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/88179400095.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62798097909.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wijulikemaw.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/fopiko.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a42f6e4---80358258739.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/17434459335.pdfIn PDF document text
    • https://airbays.com/userfiles/file/97513740800.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/53732894466.pdfIn PDF document text
    • https://citrasas.com/userfiles/file/puwizomunojaso.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/16544277406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=running+man+best+epPDF 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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 10616 bytes
SHA-256: b36431edaaaee6c4de9dd2ffe08fbbad104494bad39d817615847b3595b92055
font_01_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 20212 bytes
SHA-256: e190087036e7b92f2f486f19815def1f46827eb0efb9d37556997527f0f78eb7
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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