Malicious PDF — malware analysis report

Static analysis result for SHA-256 531835cb0b12f6c1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 23:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3ac7251ae65f53ecc33775eb032e61c SHA-1: 165b8ef84d22fd6f711dce40da8b6373dc9b2ca1 SHA-256: 531835cb0b12f6c1fe9fb12ad9b83a2448cee02a4ca8a3633d9d35ad6981589a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms. The embedded URLs, such as http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082014db145c---53097059215.pdf, are likely part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/253mvemqmm041klll77lfie6o3/xumibuditojotepuveko.pdf In PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/nvluakplfdtfb7kdinhpq24iki/tulomatadapabegi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/86814497641.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082014db145c---53097059215.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210819064505_1108535984.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/424cf1cd7a8d445899431c481d0aaecc/40800058138.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad3eceea---96147097505.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/zotalosumurexot.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/68402533946.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/28625868783.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xepases.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/diguzelometitov.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e609c2a7---gogopusesupaxaxixod.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/xuzotuwiti.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e2f61244c---duvavoror.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/voxajumis.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/89400581477.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/oj19gvhea6uq27a40nkp7b4saq/sagejojadulo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xelefuzigelukorimuramoze.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/6655033701.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/sesudurekeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=libro+babilonia+la+grande+ha+caido+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_off0000bfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 18240 bytes
SHA-256: 02015ee9c5e6327eebfe4fb7c7956566bf589fc13fa0a13b156dc22e08abd1cb
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10728 bytes
SHA-256: 482bf7f6ee11524405d0c70e3b238266731c1c3f37e1f6872acd44e167d7edc1

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