Malicious PDF — malware analysis report

Static analysis result for SHA-256 364a36a14d028db4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 23:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e837c585bc6867572d97e8bd56a77d31 SHA-1: 2a79d4fa1356beb52928413e14114acf838a5c30 SHA-256: 364a36a14d028db42d280d94c5a2d1ba864aba8a080ec25d11f0f736ab8814ac
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cosmik-kinoteatr.ru/sadm_files/58697003330.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/fepusevepodibuzurixi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43318350970.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609690840f3b3---16777523211.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/supodogunabemosez.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/buzeziboz.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/1052347821.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/84931817558.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b5f314616---52987422778.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609453dacc982---baripabedeb.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/wekep.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0572b390---30027884860.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d38ba875---kefifukuwosusufupanaxidun.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/lomujewenotuvugexipomu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/19f52fb2f9f6fe5697f0001f9c1928cc/95351820095.pdfIn PDF document text
    • http://sireny.net/share/files/nosagigonolojidozefadifu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/nulekudipibeki.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/25682936495.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/83024096934.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/77522349307.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/fepejikitise.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/87568253426.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/13388788467.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/41377851356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=add+photos+to+pdf+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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10208 bytes
SHA-256: 1270f41a89b21dac484b432d3871fa9db09f07f3451f798fa99c4ef14ead5f78
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 18364 bytes
SHA-256: 60a2dace2aacd06751027088de9664d8768d183bd5536b83079f289c42284b13

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