Malicious PDF — malware analysis report

Static analysis result for SHA-256 12582cae2e57e42b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 17:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d107a7df3969c77d336834ddba1fb03 SHA-1: d60c5604a27135ee057cb4786823e6eb341edb26 SHA-256: 12582cae2e57e42b847c682300b4f79828cfed7807609e6d0ac9a70dc8406f69
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an intent to lure users to potentially malicious or phishing sites. The presence of multiple external URIs and link farm heuristics indicates a high likelihood of this document being used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=gomovies+snyder+cut PDF link annotation
    • http://juentai.com/userfiles/files/rovikonibaporug.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/suzazosazoxep.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/4145989982.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/rikuludubivosolilefilo.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/36481567348.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/28726547307.pdfIn PDF document text
    • http://robbes.nl/media/files/58155922524.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/11338351467.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bezizawomijodulekeregi.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/kejedapiki.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/21358600960.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/dejajudowan.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/33595775513.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140274675b68---48678873552.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/62277888950.pdfIn PDF document text
    • http://deforma.it/userfiles/files/81897022979.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/denakezevelefuduxozibiri.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/73437932293.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0d5fccbdd9070869395fc6af30dd23c1/towiwamatoronoda.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/21262255666.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98784c76e---13103096381.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/7541338618.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/62662625642.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/72570630563.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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 15648 bytes
SHA-256: 887b71d1ea9d5d24fc3d4fbbc6a362cada2656284a1338e727a512c221f4c1f2
font_01_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 10644 bytes
SHA-256: 5a412f061bb45db13b38f0b3dee1967bc930a6f3054fc0950851a7b35d04dd47
font_02_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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