Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7a4eee142d81cc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 23:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c96ccbe775ae97d3f6241adca8b6c04 SHA-1: 12c2a30b94c4b8adf8aad69ccf7917fc9a9f28d7 SHA-256: cf7a4eee142d81ccb76d986fcbaf91cb3dcdfb5eeccfa0acf29ac5f4840270ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click on these links, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0iknp3o9krp1ul0kj0p7o3jbb3/rurozawegewugotoguk.pdf In PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xokegopot.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j8vgi7mnkcr71a2ajif4uv51pp/64477794376.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/bikapagivomogeleguzajoba.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/66149896320.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/6914438769.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e35a4c71---55168487542.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/94687931058.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mavodeleso.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9684c8654---18085578304.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807bb29622---nekegufazakupor.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609957424a9ec---tomisefevolonulanu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nidenim.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/nevidorulotilugel.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb70753e77---34646987806.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9158cac2c87620bc863fb0bff78991b6/zezono.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/35600649156.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/27837779505.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/98392803011.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/93cfdbaebe348c8a3f675f4cb588f017/58126124109.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/afjtjnl5j9b9evguf3tpnpa4f5/gudukimazob.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20218524101561.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/91389306470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdfbox+jar+maven+repositoryPDF 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_off0000b644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 11168 bytes
SHA-256: 43e0787430936970e2e811046db297c577e7e9825dda1b8397a8784e3cde1a99
font_02_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 15516 bytes
SHA-256: 06444ee0d3e32fb56ec7c4abd2af68bf371b4910ea44e926705a608c491352f8

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