Malicious PDF — malware analysis report

Static analysis result for SHA-256 55471af00ff97a2c…

MALICIOUS

PDF

68.5 KB Created: 2021-06-15 19:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b870fe8bd938a86536038628226cc8ed SHA-1: 803ac5eb1d92668a73d104e3c1b60b40215a05b1 SHA-256: 55471af00ff97a2c6ec99611098bd8c2fc7e49c9d9e164ea6ce9031a533c352f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farms indicates a phishing or credential harvesting attempt.

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://cructi.ru/uplcv?utm_term=c+chord+diagram
    • http://jmdfhjl.com/fckeditor/userimages/file/84484681370.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6vq7hnkg2d569rs587o19g7aj3/24333767950.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4acf5314d.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/mivosegizizuf.pdf
    • https://seeandhearbetter.ie/img/shop//contents/ludaxiri.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1866e28b8---vafux.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/320c6ee735cae2860dc9ba988b9b08d8/5434612731.pdf
    • https://acryl-bg.com/userfiles/file/80812370895.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160908f35b34f7---lexilebakekunibop.pdf
    • https://grandplaza.bg/uploads/assets/file/12862422508.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0njgavpmg077913tpmgccdcc9m/vibubodipezu.pdf
    • http://astro2sphere.com/admin/images/file/42697642864.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d017eb435bfbe5fce571d5c362552fc9/47741413458.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab74bc55db8---gakavekowoborojosof.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb41a87c9---razalalagoziparozixog.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4d5ca1a647cc6792ed4f53965e216b89/zajetajejezonijej.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d063a7cff---zaranuviw.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_off0000d0d1.bin
7ae51fe41a6da635787021e814129316da0dbdf3f3cd374857cb03f38c3632d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 5048 bytes
font_01_sfnt_off0000e1ce.bin
fae9ee113c47a93fbb1929a9ce42d2ced22e00c1f0c9ea4a223c8c83669829a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 10292 bytes

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