Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca99edf2dfdfb84d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 08:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee5d87c99655740717e48c8c1987e2e5 SHA-1: e5436c9699ce54d1338569924cac4b8e99101ecc SHA-256: ca99edf2dfdfb84d03037ca587a90c28a2488d87a9f67e0765070572115ffac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://accessibilite-salle-eau.com/ckfinder/userfiles/files/49772816865.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/c4hfjh6jgactqpfj3nsb0vdjmq/92833222274.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/rifopasetamujafuluxa.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/36437887676.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60125263059.pdfIn PDF document text
    • http://muszempilla.com/files/file/57138893548.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/98287818957.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342195ab80d---42767612704.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/98070468986.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dopurifini.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/wexudizepuzidokol.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/nomem.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/dorevigumigumoxiwepuve.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jitarisumetinakuloribewer.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/kujosipenufasukizofe.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/97122878077.pdfIn PDF document text
    • https://senfina.top/uploads/files/wuzanuvezekolu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109230117484072.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/37945238689.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18613182147.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/52044785319.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/tatemuzukukatiselaw.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/93e4d04d8a7d38683443d4507c6f60b5/99332816537.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/99975439125.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/61418136103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=final+fantasy+tactics+advance+rom+europePDF 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_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 11040 bytes
SHA-256: 786019d64e27f765cd40fc759100220ba871539776d39feae1060e3abc82a355
font_01_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 17140 bytes
SHA-256: fb9459a7c008d8daa047ed6d5aef7f71a93b9a554a6af472390d057d048dabd1
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1