Malicious PDF — malware analysis report

Static analysis result for SHA-256 5883acd83de1bc4b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 18:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2164608320f63820074865e6ecd8386a SHA-1: 5ca3b04efe7d6e3abbd077bb41a3680d27145858 SHA-256: 5883acd83de1bc4b854b26b5b7a23b08de983f58c6cde9c09b515cda6db17050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://oniceh.ru/uplcv?utm_term=dermot+kennedy+late+late+toy+show PDF link annotation
    • https://agentcctv.com/userfiles/file/sovukavonimilitigu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/5437792345.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98d23a8426---jozujakurulesumewisubal.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/58888998617.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711ff8e14ce---solejapugugesufagalid.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/juxovetopeg.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cgev465l4kfimt5f82s7uumg97/82468824000.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/12587042507.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3f4ea58ab7f7985cf07b71b747e6e6fd/85340724578.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/lenove.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2372c800---85740709538.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6457e4bf1fd6217297acb966de602557/22598019638.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b309ea337---jejatonagigizekorapig.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/cf5dbaa7c28fde49449c630869ebc6bb/4037340443.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823bbf599c7---6205995834.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/4589344762.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd2d1970c---31769044506.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bezitelod.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/91112243407.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/kabazereriso.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kabirava.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160822e9cbd88a---46936482714.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc69ca5b43---97575343027.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/afa427235b7616deab9d109fc541050d/visiramaferovibivefafino.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820fd07f91f---59958351894.pdfIn PDF document text
    • 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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 18884 bytes
SHA-256: 0ed9f3d075d347685c777a9a55dec842f98ff0ac81137ac58aaab4fc08e1596b
font_01_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 10712 bytes
SHA-256: e135e80f3c9dace49d1bdd41782ca4f3fb415a1cc3bddf437f1efb5d9cc61553