Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cf9ffd87d099fb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 16:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd2c23789875239f480388a1b2c88581 SHA-1: 151384c97c2d0492416e3988b0a6e9204e05b347 SHA-256: a5cf9ffd87d099fb8c5b4e331a1122bd0b1d9c558ff0f7db201e6354781d48df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dupurixemisavopudod.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/26brcbj6t1jfhupcosogiecmm3/lamekaweferafoxaled.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9f60cfc2---renokadetikarumufusatuxe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b1e5c3b3---lonewigezapilineleta.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/92169046734.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/17559623761.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/65322865879.pdfIn PDF document text
    • https://harmony.im/userfiles/file/76617452861.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pisafabetedukitil.pdfIn PDF document text
    • https://anandalaya.in/resources/file/dopedofisitatakisipe.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/79729673914.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2ebcf79d---pivizunowi.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/37022003565.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/49541425834.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mejekutofeki.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/nefarujupemaguvew.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pezekatadozonowebo.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/85245564763.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lolarezufuragivemexututib.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94f56b55e---6486117091.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/waduzikimes.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/wujexe.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/42964196861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+listen+to+old+voicemails+on+androidPDF 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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10672 bytes
SHA-256: 1517c9d4aad00bd7d16d918fb800dcde0fe6b750b8389c4223b6878064566dee
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 17652 bytes
SHA-256: 648340042f8bd38eb6aea5a1950608faf8c05eac2fd74ccb11e76319c3f247de

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