Malicious PDF — malware analysis report

Static analysis result for SHA-256 9997dff24017e9c1…

MALICIOUS

PDF

94.8 KB Created: 2021-06-27 05:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 483028bec69a8bd306e3b85f72171987 SHA-1: f6876d5754553fc65f65289ceed527d1c4fbac0c SHA-256: 9997dff24017e9c1a05961d8dcd561b0fc4be902491413de5bcf09e03a00307d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites, likely for phishing or SEO poisoning attacks. No scripts were extracted, but the presence of numerous links indicates a user-execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=student+visa+interview+questions+and+answers+for+uk PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1lce6qstj5u8l21ogvjk7f6292/zupiroriduxelonapi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cc2ced78---57616342535.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xopazepukubavudasem.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894351d05f---38837740775.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8884b18f0---44987950254.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3de238efe8c93810c1928163c7c660c3/14100820394.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76ee693a401a2ad6aed1612157a099fd/rilipozodabobovewuvem.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c56094cc---26999770394.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e8912a75---62615395142.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e4e4577f---tinulevumejogetova.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/kumap.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/v8qie3c4jqc99h6o2rlkdiskl5/gulazeron.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/53087154851.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/jidawenojima.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c7114f80bd1bb75c5882db509b789ce8/56961846706.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2f6a3820---boxanejorumal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7e428c1b---buxekafubami.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/219ac2f44e56f67de8c9cb60a99426a2/fasetigadebegarapokaf.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/57768df43c0056a787190799498da7a3/pofinidiwikexibabamapas.pdfIn PDF document text
    • http://hkalc.com/userfiles/zezuvibarofozub.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e1b76fc2---gaxekexajolikodijo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/36920246978.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_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 17932 bytes
SHA-256: 85e4fc29b70447aa50b2908480d51a07461b8733de555d0b45b10fd5b7722383
font_01_sfnt_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 10868 bytes
SHA-256: f9b4f4e3e2b28cfcf24cdd73a5b3af95ddf85501ea1600a5ec05b4b99f38dc0e

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