Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc37a570177875c8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 15:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91c6031e75bd41cf22ac071c37c8cc6d SHA-1: 74366bd9090f01f657a6e72195e89f942c4ebda5 SHA-256: cc37a570177875c80f8ddfe247d48381145dd024568e179b1ab505fd2adc8435
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=ways+you+can+get+gonorrhea PDF link annotation
    • http://lapawan15.com/shop/fck_file/file/modipopabejivinaxovubijud.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/65645313164.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/69187816820.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607903977e49a---42152899681.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2758ea89a8---fuzinomuxokoxufiranaxa.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/34184537358.pdfIn PDF document text
    • http://thegioioto.store/upload/files/78654562288.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebd49afe3---42892687758.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/24868206030.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4211f2df78---38251437913.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612995b998bd0---xotunomotilelo.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/70344947681.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kfp7078cdbgctjtfbj98hbs21h/pavamem.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42038693016.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/56982200871.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/19859413367.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609164e5d9ad6---xeferuwumerug.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/55c349190a463f371d7100a579bed8b4/86248685179.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/43758696216.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/75678051198.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/79363334997.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fbvtq4svh1tugtt9a4ritojhp5/94815977495.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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10576 bytes
SHA-256: a3088872d2a08204e314ee16884f6951c8f5af507c327f35cd8c47aefe2995f1
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 17372 bytes
SHA-256: 3a997f6199c0eb340d8e41f63f7a22f42c1d7b0997b7efd80186ee61b6fa958b
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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