Malicious PDF — malware analysis report

Static analysis result for SHA-256 46624c6658dfc7f0…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 13:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1022476e55d3161188f1a940a1f2a394 SHA-1: 07d84e0b18338c646cc56290e96da96df22c608d SHA-256: 46624c6658dfc7f0319c7bc24d876ae5a6479d4407fa5e7cd721316305ba25a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or redirect to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic indicates a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://healthmatters.me/userfiles/file/kanosunuwasapu.pdf In PDF document text
    • https://nucamsa.es/userfiles/files/xemafozerafi.pdfIn PDF document text
    • http://ahchala.com/img/file/kikuwaruxowixipopi.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cca3850adaf6b23da119a077af926949/xujogidulelixepidofunuxu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/29999584941.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c53b4655a---ludevuledelikafawe.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/80890699693.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2df35c0411f2b3e850324df3b2567e6d/selesogitex.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27b086b542f1f75285aa50588bee3f0e/sijipegukorunizuderos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s6jc7ipikqkoaoedq0kpuf8lq4/63094210645.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/49465726678.pdfIn PDF document text
    • http://ippon.lv/uploads/File/zuvewijudorekiburi.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/908591c0a86cd88c86a83692089da7f5/taguredudajapugagulid.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2aa7ca7f2c---63279764594.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/520850480dcffa5d902620ef585767fe/weworezumematerobuwik.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51a20df376640ec7026a4927ac7087a1/5950147398.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/zexuv.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/ravubep.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8262bdc881---72573222890.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7795fdf84a---116622910.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8624e7109348f8c1d678dfcbe8953c6e/48429712834.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98b7af09d---3778066647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+group+funds+on+robloxPDF link annotation
    • 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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 17796 bytes
SHA-256: 3977a80b2b9278c2ff472419d12c3a7487da71af5ecf638fe3006b6ecaa38ed3
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10840 bytes
SHA-256: 8b3a3eacd25110c4c2383e37c0790ebed87ae32785eec440fa8df2e046a82000

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