Malicious PDF — malware analysis report

Static analysis result for SHA-256 366fd3e64e3f4191…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 22:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d950ed0b83f1a2418e2e8e0cea1f91a2 SHA-1: c13f57c2864d8c2e732472076f12b4f2bdc23a95 SHA-256: 366fd3e64e3f4191b9b72d45a5de8336f4d546fa723ce5ab93db7c1b7124c5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect the user to potentially malicious content.

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://garglob.ru/uplcv?utm_term=every+note+on+the+treble+clef PDF link annotation
    • http://akinmedical.com/uploads/file/ruzulerijorolet.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/12510279588.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08a744f816---76267772775.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/31146519404.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wovixevujodebotodisa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b295c72d128---54508226455.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b886d720---50275919387.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/xapibi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79882a218---38681793162.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/22104848771.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920b935b7e0---rubowoxo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/76kbqk8i5jplepkl1ds0ie9jlh/71005251337.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jirisut.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67a0944e0---vurewutonutivegotalo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/325a1heqm5c0n2l1cqst5isn52/vexefedavexazulegivefol.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/63998870423.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1c3prnsn2hpihes2q79u9deg01/bozavukozo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203140654f---42518968816.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9kr1qf8jqcvmqreifcue74ac6g/5755055006.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ab55e303776b085c79c59af5afe9f892/farovadojukikuzivuv.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926dd603eb---89793712807.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099deffe8a83---vabosige.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/96145898709.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_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10312 bytes
SHA-256: 2c5b3d413c8e548c80e40a31d8662c5a5f053b0bd8d70ccdf5f9d9b63158b57b
font_01_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 18324 bytes
SHA-256: 4a45e7f166ba4e1e219c74bec413fc75cf470f81aa0abf6bd765c613d0fa4101
font_02_sfnt_off00015279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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