Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dfda1bb0887024…

MALICIOUS

PDF

85.5 KB Created: 2021-07-30 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31c41e8a1530b75628d1bbcb9b0e60b7 SHA-1: 2c1c98fb7f152fd342d3bd9df11a79dbc525aed7 SHA-256: 67dfda1bb08870246596f7bb2e2838c3eaea48c3ba00f6a30ef99958e21fdd6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting it is designed to host or redirect to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e79b84ca414---93713849910.pdf In PDF document text
    • http://tomei4x4.jp/js/upload/files/gunovatulezelekodeti.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e6773d295bb---98180478887.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5fb4a92f2cae22d6462c17eb3d02fef4/19333015739.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/tedewosepul.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/mukov.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/wetaxefefibi.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/89968057874.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/liwoxedaxonefegarusego.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160892b1e3962b---13341831308.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/pesuwebilukubawimez.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c4049b64---lenazimirizobagekowo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d283d242b5---47453989464.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079246a94dfe---wabugozejufodoro.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/19948907878.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4db3f4a7c16fe98e368a6bfcdb749239/11709964583.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/35801155698.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zosaxanusasuvedofusep.pdfIn PDF document text
    • https://inifd.london/uploads/file/12951220971.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/216b4fbfdb7dd433d483aaf172ceb80c/jeridedapojo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b6301582e6072ffc0903257a753d89a8/fezisebide.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5ebe50f4cc60499fa670efc03621769e/fasutikuzoxapupuk.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845dd8e9e87---46831575694.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/a3e77106b007ce4fa2df27af3032d6f2/60292719116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=troy-bilt+zero+turn+mower+drive+belt+replacementPDF 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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 11072 bytes
SHA-256: 39c833f581d4ed3cc6aebad811fa376bc77d9eb035d65e399e867003e09a2cc0
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 17000 bytes
SHA-256: 15965202cd3a05fbe727d2e1df5700c43ca64671a27d18428d44c3ecd0d81244

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