Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6b8251eff42184…

MALICIOUS

PDF

75.9 KB Created: 2021-06-20 05:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a97f60541c7c9933ad06e53f27dd92 SHA-1: 5794ddd58229e4b85486e2f78de11de9a748f7b0 SHA-256: ed6b8251eff4218447b58bf868bc968f12c4c4ee04144fcd9758eee6a7480b9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://synerhu.ru/uplcv?utm_term=alone+together+full+movie+stream
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/17e1ed17501a978951d82475d3964ef8/92494601821.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba5a9b1da5050326143d746b2a0882f2/10582949824.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38721e78328bd2561bc2d72246fac0d2/segakidip.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609921882e116---68584579490.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e65580e60---punevogadirumelilotezume.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f43c57da---bakelopupegokixelavemofu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac32ea092---gikemarugofumunojixudimu.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/6564900275.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9640d74718fb21cf92a252e26729ee55/34549455888.pdf
    • http://schodylux.pl/userfiles/file/bufumaga.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0fb1ed5812aea68b10b8e06bc3ab163/20130946265.pdf
    • http://africa-emergence2019.com/userfiles/file/81461834882.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160777386cbf75---fujalax.pdf
    • https://vildmarksjagt.dk/userfiles/file/rizaluvenepedu.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f223b7f5---83192341941.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7721879d5---pedaf.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b7688cbcc2c---zizefurenevavikijozogin.pdf
    • https://radmangroup-ye.com/rgfiles/file/tesixomujerokakiruxovi.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_off0000ed1c.bin
3631fb9ec69081f34856479ea22aba5440e0bfbeed297451e12c826a52946698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 5228 bytes
font_01_sfnt_off0000fec2.bin
1b4d5d7341c8d5c9ab32d145ce7b92abe2b8de4d2e924422a1bb7640b95631cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10724 bytes

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