Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bd73502d036ac6…

MALICIOUS

PDF

64.4 KB Created: 2021-06-19 22:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d11c6a5274a0c5baf84bc83bf33e051c SHA-1: 37d445d95476974d1e76782b9efefcd581a045c7 SHA-256: 28bd73502d036ac674633bb6b06e848ecee62ecac77bcfff6740c2e17a2b2e7f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised WordPress sites. Multiple heuristics indicate the presence of numerous links pointing to distinct hosts, many of which are associated with formcraft plugin vulnerabilities. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lead users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aeca956afa5---28167546151.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140cb1f214---vapegufajudomikasivivoko.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/16149869299.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c92d44ff---tagubo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b2il7cp3b0r9v46o0vfc445ecm/zifimurelupafi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/96931575142.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac7d7d7f3---kizepera.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751bf9b2963---29136279704.pdfIn PDF document text
    • http://princeverma.in/uploads/files/85994279811.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/92631582927.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jesatq10vs1jcgs8gcmuvljdpr/rukezujixolorumidatus.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/95220585036.pdfIn PDF document text
    • http://ahchala.com/img/file/jegozupoxoxis.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc3569fe9---21489297664.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ef51643f---fezovuvatazimekamege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=broken+heart+bordelloPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4E 4988 bytes
SHA-256: 74f8502cdf1fd3f85af9f51bb704d2d94b954afec2e833555ccf9b7277563594
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 11060 bytes
SHA-256: 35bf0292592316424cbedefb98041e346b843c3b4ae9afaf8817e2a1bda82d5b

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