Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0f4eff749c581d…

MALICIOUS

PDF

92.7 KB Created: 2021-08-09 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbd2549d1849f07bc50f81d25d0e1b4d SHA-1: b872bd5ea9937c69aa05f5b04781c70297f8919a SHA-256: 7f0f4eff749c581dceaa2af25aed5adddf4d083b8c305e9ea690edd59a7c779d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to WordPress sites with 'super-forms' in the path, suggesting a link farm or exploit distribution mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9570d90136fa5499a51cb4080ee32968/3473477572.pdf In PDF document text
    • http://archifolder.com/userfiles/files/7319623955.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/952b9c6867a707aaa13827987c4fff52/15182552580.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/526bda2258ef8fff1b7d24dd6fe2c5ad/39401547431.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2i9n6kgejeg7tt63e2nsasvp39/fonogipekewar.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/nidenidowexit.pdfIn PDF document text
    • http://kalikraft.com/images/file/37531651430.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6b679452d2f78fa20319a9d979551121/50648777310.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/futekesefomo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ca629e571fa---79203435806.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/92353125482.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7cb9e520bb2ee99192bb3f961ff4f3ee/36329322649.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/42578373754.pdfIn PDF document text
    • https://hirurgija.me//files/60719721.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b032323b---352835242.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5a77ba8872a8d9bf823b72a1e83d8f5f/1936297892.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lebijugenif.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jirojitebotajedazalofomip.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/fudolinewubosuta.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/puronifotosikoxapevoru.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/37539fc76f89e86f54907ff528eb0e27/digumeti.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5fb3f414e---31337863902.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fb796f982813c5eb08f8285526a96ab0/tilokabekojovujotukububir.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c6216716c9e3a86e4d54f53876f3294d/96106075586.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b7ddcb72e---tenubedujakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mkv+hindi+movies+free+download+for+pcPDF 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_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 17380 bytes
SHA-256: b95977925cfe509c0dd823268e46c43c90eb091b19b4608619d37048610c311a
font_01_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 11024 bytes
SHA-256: d49443a47b0e755ee2ad484ea5c951d69c5baa331772a5f5d72bde8a321f2e0a
font_02_sfnt_off00014c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1