Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c7bbd9324f6864…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d84d0c616b51e5f02b7217a703dc56c SHA-1: 5646da54e29dc6c2c3fdbe7cfcde2fbc2c03915e SHA-256: 22c7bbd9324f6864cd75773359aca534525c3b3cabe1d1744479525859fb1fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various external URLs, many of which are hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution attempt. The document's structure and the nature of the linked content suggest it is designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=economics+for+dummies+3rd+edition+pdf+free+download PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b31185fe---6255794932.pdfIn PDF document text
    • http://lucann.com/Upload/file/woxijovuve.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901110834515231.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d45e5716---40987709083.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a50dd09be045f4c22145263b0d319ec1/xerofoderewatoja.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jununosisuzipog.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/79847159140.pdfIn PDF document text
    • https://soechi.com/userfiles/file/7564474155.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa476c3f250---35345315766.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/221935249396.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb736d8806---gewawelirewo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/garar.pdfIn PDF document text
    • https://mangallagn.com/images/file/zaxom.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/fidusomesoserumebakude.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623343872.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/92891405142.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce9ab73cae---xujudeg.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/nujiw.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/mutedujogan.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/lurubupejezav.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/42bd63d191779181a5ae38d46cd6c6e4/77266127439.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/wexurezavefifa.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/21988813398.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 19248 bytes
SHA-256: 7d4946dff379b1dae5828ecb0e2db7966ce703cb7c57e32671b691c3eea2fc49
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 11124 bytes
SHA-256: 899b5697deadfcfb96d088e1204f9f12649c4be56b345752a8c3b1b4b2a49996
font_02_sfnt_off00013a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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