Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfede8827f4d8760…

MALICIOUS

PDF

98.9 KB Created: 2021-07-13 19:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0bdf1dbd232fc0a4e6b4e810184d1b7c SHA-1: e1aa8f29c8d86879e8c084f3ef25d2bfd1feaf7f SHA-256: dfede8827f4d87607cad7e4197b015e9515e0ab1f5c2c95c2617aed34b2971de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://cortabellanews.com/userimages/42499709999.pdf In PDF document text
    • http://donghozibistore.com/luutru/files/73672519919.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/au7v5d6u890925l9hs6iaisvrt/69956114292.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79c2418b6---63847350853.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/tevuzezeforiwegozowe.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/pokeparapuzuraxome.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/96957edf08c9b0630d5340c8f06ca89d/61124563949.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc9ddd66e---97236589873.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d6db3e56---4174173439.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/m0ejhrtjj79efpnmrr0hdnh81a/bowoxalepenibaginase.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bfacad2---90452099218.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202162616228880.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/453658107.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/48693444485.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/dozavebizaladugofemi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dj7hrf52mld7e1uuk67aiki1d4/mupipamadiwosixorominul.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcc8db8a5530d0b8e2f9c57e7f2b6fe/69293820873.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/tujavigepa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09a900eee---47499030065.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ac713f6e---wivul.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/tiguvukirokakejub.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7f8e3175---kovawebixojilunaza.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a43d6312bc60882d5d28ac27a2f14b53/rudofomalojexasobeleg.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/6ba0cb9fea30ddf49f52d3af2904334d/soviguvusifumudupogen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=adjectives+in+order+examplesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 1952 bytes
SHA-256: 956a59ce88d16d18682f88e8006d486c34ec2890eecfa153a08c3a0b5244bc99
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 10952 bytes
SHA-256: 408c5ed3a0c8ebe906ec3fcd4d09843fccbb89b97754eab8f571ee70e086a7af
font_03_sfnt_off00015014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15014 17136 bytes
SHA-256: 04ebd02b72542f4118387e104d36098cab4b8823e0d1f46f06d197e786ee0f48

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