Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdf8d8311141d93…

MALICIOUS

PDF

76.5 KB Created: 2021-06-11 23:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9c7165aa73dc7edcf8d247c261c8c3 SHA-1: 59edf4b8dceb4d7403b4eb8b06067b0cb8790d75 SHA-256: ccdf8d8311141d932612f1628e8e45706799f4a1721a28ff3574df87345929af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The embedded URLs suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nomylo.ru/uplcv?utm_term=angel+piano+music
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/52bf4ff89e13e9c441262eaed53a9e8c/gofimejofukikideguguxeka.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/webimofunofajenofunik.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fc2e9585---8367579626.pdf
    • https://nevisnews.com/userfiles/fisadawoj.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608382779dee8---49782537841.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d925a6962982df5c2e6a7cbb66b860ad/bafujoxe.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607447e9c86c7---54374073499.pdf
    • http://polletnv.be/uploads/files/fetolitonowetunikobujun.pdf
    • https://suma.ca/upload/editor/file/kukuj.pdf
    • http://crmrealty360degree.in/userfiles/file/zevoneboxukuvul.pdf
    • http://malbreil.com/userfiles/file/divikaj.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb31ee9a85---21978037720.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094360c40c64---36897262208.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce38c72e7---mekekufi.pdf
    • http://beerskiboot.com/img/upload/file/55509170069.pdf
    • http://babamoleskine.com/files/file/mejefegafunem.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1db73d2671d74fa9524e6423f2eb1b09/losigaduzukenolesebi.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/063b632316134809f05b99c553db4e1e/9127810131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef51.bin
0b4867137d675ed6910b51d6573103df0e611379bdc33fff8fad31d5695c6708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 5144 bytes
font_01_sfnt_off000100cb.bin
417cd7376116fa3418173d3cb9f4031a247fb632cdc9e95cb3dfdadaad6416e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10816 bytes

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