Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d2eaf2f0537ded…

MALICIOUS

PDF

63.6 KB Created: 2021-05-01 10:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e3b388503be9af54325d05a2903f12b SHA-1: 292a5ea0a6126db1b887a56d74f62e7d2488a0a4 SHA-256: 89d2eaf2f0537ded065bc40e894c04fd944d49b9638fb215fc0c8fb04c4eaadf
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection further indicate malicious intent. The embedded content, though largely unreadable, includes references to 'wkhtmltopdf' and dates, suggesting it was generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

Heuristics 5

  • 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
  • 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://asthasupermarket.com/userfiles/file/jubumakasurulab.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607665ce23b88---makefonijisilivuzekenas.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb3ee4e1f---kukosasi.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/45da3e02fbef53dbb1060f973e7a8c4c/rabago.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/94a48b0c947f4ea997b13d5049784e0a/71848727362.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4903fe0678fd542084954ca9973a5a4d/38546674246.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cad9eec4c---lilugu.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5850a81bbe5b54943ae434e92577337f/vapimeji.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608341ce636fa---zegilurewamojuvifod.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/abc749833735b6dd2772d1a093dc4ce8/20967332999.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e0a2fb50e37c9f71e5d298a7f8d46439/dofumibuwedexabujajomukor.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/18031f7bda3009391c65a810ea150377/zibevifimilivekeda.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/79113012366.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d5e9795170cf6599ec8f18776032f682/36361173120.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f9d6426---64594345224.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4a1c994b---59393767700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=alif+laila+sindbad+jahazi+video
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdc.bin
cc41684debb9bc4ace2b330142a036199b77e982a85c7facdf95b2f35483249a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5216 bytes

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