Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a57248a2a6ee690…

MALICIOUS

PDF

91.1 KB Created: 2021-09-04 18:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6123c2abfbf5c5eb51eef0f02ac04eae SHA-1: b82cb8696816039bf2e4a962acecc7d7fafad855 SHA-256: 3a57248a2a6ee6901fe90ba55582e2c64146b06439d3dd4dd1b7a35d86095a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=algebra+2+worksheet+graphing+log+and+exponential+functions PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637896b54d---28402891359.pdfIn PDF document text
    • https://led7.ru/file/36024395462.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/57059534146.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1vefp9c7nfmh9vhoko3959undr/54405539560.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/muvoleluxajojo.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/rogapepekusajisopugewupug.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/72015ca704c04d8d523180a382ac9627/82179808014.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/werekavuberuzud.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/80038905907.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/polupozofiwe.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/52699116863.pdfIn PDF document text
    • http://szpk.hu/_user/file/kafalira.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160838c18751f5---gerenuvosa.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/63429041079.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630736985.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/44321115574.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffdf75584---tilefobevudogo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc692493a94---40596248818.pdfIn PDF document text
    • https://coatielectronica.com/files/61012606952.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e28664e---jafonune.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607960c8159fc---55247792563.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfc92b130---gazugebugamadefozesafisi.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/3714454491.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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11520 bytes
SHA-256: 8bf2324d9730c218249b28d582b7371e4e01f8361c9685e57334ef721f162162
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 17724 bytes
SHA-256: 028537ccab785ac80b0eb3474996f21009da976c7ce45163675b915f06bcd244

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