Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5aaf464905234d1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-23 00:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72fe562c4236c56179a9b0c59ca6a137 SHA-1: 6b35ddce30ab450398c523237501c14a8aab3ba3 SHA-256: d5aaf464905234d140e6c4bbe756fc39ec20e8f558ccadf61d61c04600f72d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL suggest a phishing or malware distribution attempt disguised as a download link. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=ghd+sports+free+download PDF link annotation
    • https://balmbeach.hometeamcorp.com/images/usr/sagonikogufapigunakapisu.pdfIn PDF document text
    • http://lachina.cn/upload/file/38833421679.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zixodidezozalibumojinate.pdfIn PDF document text
    • http://surausa.com/uploads/files/71232061928.pdfIn PDF document text
    • http://vititanon.com/user_img/files/82141993641.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xebulokuleg.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/xabewanuxi.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/37988024019.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcc051334---vugebadizavenuru.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0d93cf13---93412102893.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613da27ee278b---gotutiworezewefuta.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4741708fd2f645aa3372793116e98ad0/91090576604.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451fd88ee32---dopamazemunegawirusuberot.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/mosiwipunojanunedaku.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xikixurazanine.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdbfa8cb7---gupawusarezofotirelenev.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f3b6cfd16---rudiwerixegigekufur.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/mebudabupegenofebobilane.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexusizasa.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/50754782861.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161466744e0b42---71718651297.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b17eac990ea087a718b6ab8d11811a6d/pivuj.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_off0000c1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16164 bytes
SHA-256: ddadc82dbea0699adc54ab7e62b66c1b9b20be2455ffb99fd4ea548c1e9878c2
font_02_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 10628 bytes
SHA-256: f81e0cc6d62b0f8018078c7f3b8dde3c9cb7a3cbf3541b5427dd104e1d6631e7

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