Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5dd2f0fa7d7bd8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 07:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d70cd813798ae8d546fa74496960724d SHA-1: fb8efcd660c270b936e2204573985bdf2f491cd4 SHA-256: 4d5dd2f0fa7d7bd82ca349a5e92ef9b437d046cfd05fb34f40bb0c976690f4bf
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable or potentially compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://topaslt.com/userfiles/file/jijasasowegifojugofewuda.pdf In PDF document text
    • http://belstroyiz.ru/img/file/16765917004.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/jupoveverunimafe.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/6562109617.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/3038027004.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/10361756306.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/89757103489.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85ce40029---mabinopesegoru.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/29443562495.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/wizilovexudinizamuboxu.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/61028772443.pdfIn PDF document text
    • http://mebco.ru/images/file/xazujenepekabepitof.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/377c7b4201372b802cba9825f3f9b608/38211832441.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/bopijidofixodigaz.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd85286b5e---garetejuruvofadafat.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nenemudezusij.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/gakuzu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/romus.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109121928505545.pdfIn PDF document text
    • http://dasbluemchen.com/mupix.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/gafivafub.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/92648019521.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/xezevegizotobodizala.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/mobogebuvuxajapowobagiso.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/54105236139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=i9060i+flash+filePDF 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_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 19372 bytes
SHA-256: fbba690df204cee6c3e82348d2d24bf41c18b471eb6fa781ff830f9b2b57e7c4
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 10296 bytes
SHA-256: fd2fb213a7757857374dd1ae9caade696b1b536aeb105551549185be9d8d7f0d

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