Malicious PDF — malware analysis report

Static analysis result for SHA-256 7495f84e6e21bf54…

MALICIOUS

PDF

99.3 KB Created: 2021-09-12 20:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5c9fcb182dc7047fd7bce959c373aa6 SHA-1: d4e3a38845be522ba3d823c65a7da25faabcec9f SHA-256: 7495f84e6e21bf54ff064f8cafb71f3eca6150abcd3166d05ec8afc5125bc42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=software+para+gps+android PDF link annotation
    • http://balbu.eu/uploads/news/file/95765932393.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313389dd606---48827455885.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/luwonixikome.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/jalesemuvadepar.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/kuxuzekujorajora.pdfIn PDF document text
    • http://storemisr.com/uploads/files/35075702401.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/26183524575.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/87247615048.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/pazetoxuxet.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/64748350750.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/15705722660.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46045153703.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210908_144420.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/26858683529.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/2947432796.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613995742b4fc---89137859273.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/65760098238.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/kimen.pdfIn PDF document text
    • https://trainova.com/userfiles/file/tofaliwotorer.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2719715161f2985dc96cd95f9747d6e8/nezeginegatewesib.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zezanufebeduxiw.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e638129f6597e6c832dcbe50b94a7605/33830912078.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/tokegu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202193199312110.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_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 21888 bytes
SHA-256: 4ef97af92588df4c85d2097b0c73f6aef891276d46aef572a7c2b63738b3d5c5
font_02_sfnt_off00016677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16677 10788 bytes
SHA-256: 0e9c4f03fa86f11d20f877c4baccb2d7c6d1a868452a2ed41d3cb4880f04fb19