Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe6e23b3ca80bc1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 01:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ee654e5cdfa74a18be250eb89b49a17 SHA-1: 57b1e1e4b2bfd3b5ed23a43a707cdf0459732afc SHA-256: 6fe6e23b3ca80bc15da751435f01837d632589a5d8ae734ef52c0bd018e530e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=after+c+section+delivery+my+tummy+is+still+big', are key indicators of the malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=after+c+section+delivery+my+tummy+is+still+big PDF link annotation
    • http://ridendo.cz/files/file/56889993889.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/70e13d80a20679d4cddaae753df9fcc4/80373833420.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7gj00bpf723riov5ejfstj8r96/85449104025.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hc608sb85qa3l3lqtort559dbc/jebupud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40eec9e76---47020825073.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88201856252.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160830922230d2---53822933580.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/sukoboga.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/87ct5qld7dscuiadqbc5jfeag2/bomiji.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/jefexixenuxote.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/49074561196.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/desinowutarotobe.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f860d48e5eb3994f23f1500a55046b2f/67128258912.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd66dc5c0---91739907243.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/gaginajoj.pdfIn PDF document text
    • http://exim5.hu/_user/file/6488689039.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9b9b0cdd---48849654916.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210823/file/41686642944.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b4eed18f---fowisejavep.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zovirab.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2607e562---19750606671.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/81b93ba313fed434aaa713e14153a2cb/fenimibimopumaxosi.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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 16364 bytes
SHA-256: a29822e3e0d9744f2e8521f9daa04f8d7d5605f9c165218d08fc6ec8f6e3f147
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 11060 bytes
SHA-256: 36c40b0c5fcc1116c7b2262effb1e22eaec7413df6ce1734405e3c92fbc587d5
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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