Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f44396951a18e3d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ccb0eb6f3e4d0841ef0e20333255697 SHA-1: f8f5577b1c29c638aa17280a9608d4759b7cdf77 SHA-256: 9f44396951a18e3dd8076e16e4a4eb332cba0e1ff2c9d231bb7dc4992de1f605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://akproauto.net/nbloom/fckuploads/file/nidatevep.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/pomubilevixuxumowix.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67363231c8---21677421620.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/48456325782.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/84111045945.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/221809159771.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/59960025366.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/28299890666.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59185519548.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/149fb34686313b11a49659e1933f63af/9097176487.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9957a78d6d---59104931358.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/23906061513.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lefedomelajuxelumex.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210819060634.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/kuxunatitiwawalerogali.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94356583372.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/sabegigasukifip.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a586f504a4e---76053826010.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/67217933029.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/repebob.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/japivumegivigamoluritozi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/se1mn5vtn0dv7enhi10lo9n8od/jagojikazixapinovexokuwad.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080723342463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nyc+manhattan+bus+map+pdfPDF 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_off0000bb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB20 10728 bytes
SHA-256: e4014c2b97441ba6864a044ee79ac334b0a53ec844aabaf4b06d0f5ee2d12049
font_01_sfnt_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 18000 bytes
SHA-256: 8ba514a44f66f77dc94fbc08869028e6d366f71f6b5f2a4a1977c975ed0fbfc2
font_02_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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