Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead85ba63dc04069…

MALICIOUS

PDF

65.9 KB Created: 2021-06-14 05:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 86ae05d0cd8f087401133098a646479c SHA-1: f459329fcd20801209e2d7621fcd2400e632f7a6 SHA-256: ead85ba63dc04069ce8bd2d23a723d961e72e2ffb718190ae73b01f3cf7f34a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting its primary purpose is to redirect users to potentially compromised websites or malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=brittany+daniel+the+basketball+diaries PDF link annotation
    • http://dzbnf.com/upload/file/%5C/87938379579.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/6253070998.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106131748442702.pdfIn PDF document text
    • https://unosms.us/userfiles/file/40529756458.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b471ec55abe---bivogezopupoxura.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sazogujimobozaze.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/dituxem.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072afb61d3---nufowotalojitij.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/gufijojiri.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/332fb0bce945db8c8f7d94d83e91ef56/17699694734.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfed46ec7522bebab8ee62aa55d186f0/zupipi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/de4dc89182a822b053d7950bfd8537e8/54381829030.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7e194e1ed392bfdc49e9ffc447cc295a/vakotawoxuvumukane.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59856ac1f4---27876787629.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/tidagaxifosifibirokaxolul.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wojalabufimun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 5268 bytes
SHA-256: ad0854d7613307fee238e4973b1f134ea74064c9b37d8056c631d5953201352c
font_01_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 10492 bytes
SHA-256: dadc7256d840b9eac4d3ea5cd8bde5753a2af321af8c240e31a99abca00b4a57