Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59a45644ab0d3a4…

MALICIOUS

PDF

73.4 KB Created: 2021-06-02 23:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0054a26d1e008401698375e9e89ef1f6 SHA-1: fe61950e07614aeb4bc1edbb20c90949723004f3 SHA-256: e59a45644ab0d3a48be5e871098ad911d9e2d3be5a1ea2c92ca535e1c44fdc3a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

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://irlanc.ru/uplcv?utm_term=fernwood+2+night+dvd
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/20cf6c380dfddabc2fc34f0225df3ead/lipew.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1164ae54d21a26f97d48f6066745231d/xugabavazituni.pdf
    • http://vamaconsulting.sk/userfiles/file/jonigapuvelovalosifa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7m9ke4u0l4lu96r04fe5hgv6v7/potevusopipomevipuzolod.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/oacahhcdihhl9c6dcd4r7cqcvd/xisezenilajopev.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3c37fba5---11138166606.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a88dc3321a7---xevimizavigukikaf.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/n50b3sj59mpov78mn5enc8j8uo/26741053340.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/36f3d30a7ef3846696b3e8729acfeb50/47774861281.pdf
    • http://alemotta.com/resources/original/file/27919700589.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828799a0643---kitawusij.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160762fa43f983---81195593326.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/cqtb69oi4fuvkhifged1n007ro/wirujazavuzowu.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cps7lrqk7l3soikaf5pmputn56/xetogax.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/853393203b3969b90440f4188900f9c5/16205877292.pdf
    • http://kasystemofkarate.com/clients/861259/File/kanebaralawodupokejafurot.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5b498992c71c511cfe63ae271bdf82c3/kegamole.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e6ca1aad---kaliw.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_off0000e43f.bin
913b6e1c3e96378bc9b75b2fa990ef9e586adda16081df638c17773dc4baedd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 4904 bytes
font_01_sfnt_off0000f507.bin
c64fe97d8217d6fe865f7f70f53c95cb4e2c259e0ca5a72dcc24f2344c598bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 10816 bytes

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