Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d4cc035a720964…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 05:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95d8e44086a63aa6f941a0f307fa61ec SHA-1: 960a334b0a8784724565b777f58c58d07cf3cf50 SHA-256: c6d4cc035a7209644bfc9676dfee125fd1aaf2719b6cdcfbebabe1d0d63ce5f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c69a66b8f---xiner.pdf In PDF document text
    • http://ridendo.cz/files/file/85530782427.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/fakibedokus.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/wejiminozinir.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0a540fec---venazigamutubumonufa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609129ea67553---40554657848.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbafdcb182---peweli.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071405095573499.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/12118346930.pdfIn PDF document text
    • https://5uempat.com/contents//files/35224441359.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/tewakufenunapuxuwojuro.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/91101573111.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/lebofidevokujumule.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/96409195643.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/36627088657.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/39767477912.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ct2i5f585rufvf130i3rega6n6/15390562136.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fab0d7bc88807ffde71defa9924bcd3f/35335196975.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tanel.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/tolajigiriruzoxiva.pdfIn PDF document text
    • http://klaaswester.nl/img/file/lajote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acrobat+reader+pdf+writer+free+downloadPDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 17216 bytes
SHA-256: a03e47ffac2c3ae956488b7505859cc73d5a4a75576cd60be17405e5af4c5b82
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 10652 bytes
SHA-256: fbcff823e0294c27eb77c48e9d58fae1d93d956c5c5d32a1b680f3d37c54b266