Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6f334edb3ddb8e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 01:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63608335dfadee4d88afa9ce08e6ac61 SHA-1: 2771a19acd6894471df8bbe1ee3a82b162b879f8 SHA-256: 8e6f334edb3ddb8efaf0e56ff40876a9dce8bee7f8d8cf8305e99119ca6363aa
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of numerous embedded URLs, many pointing to compromised CMS uploads and using SEO poisoning tactics, suggests an attempt to distribute malicious files. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://binarbaidrealestate.com/public_html/userfiles/file/38584376498.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79e4b6a7088a2e627cc94634ac9589c9/lurujokizirijaf.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/85524981235.pdfIn PDF document text
    • https://akconta.com/uploads/files/91674158616.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a79a3e8a---82907212290.pdfIn PDF document text
    • http://dzbnf.com/upload/file///35613553708.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/95913908208.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ddb7da4a2---37117603882.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/94853011406.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/bezofidujo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/ludipemupeletamusibigid.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef5aa3080---wijarezuruven.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210626_135724.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/39eovd6thqgglhrfekf4c7dth6/vimogaxip.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/wafugu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lokurigon.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9e528b2468fcf65d4d0170837d5e29a0/19043319245.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8a4a2c68a---22833880137.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b564ed7a192---fixibimuvi.pdfIn PDF document text
    • https://servicepapik.ro/files/bawafadoturuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=nda+exam+question+paper+with+answer+pdf+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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 11172 bytes
SHA-256: 72dd81c720b18db79eb570291fe82a111e5b387ab7d745e17c8a5cd3903f42f6
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 17336 bytes
SHA-256: 3afe7517004dcdb1af1c7ac068998700f1dcbd306c188771991cee6081ff0516
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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