Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54d10eb08357ec6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-25 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9260c0b2dad71de5b728edc412cc732 SHA-1: 31d054cc440ee6cff70bbc0b0758680089407967 SHA-256: e54d10eb08357ec69ed51fec9b203b94fb828557cfa244a9fdcde48074b967a1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to lure users to malicious content. The presence of a link to a PDF file within a WordPress upload directory further supports this. The document body was unreadable, but the heuristics and URL analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317dfb1ed58---58426757915.pdf In PDF document text
    • https://kocarbonag.com/luutru/files/20637012933.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/petitozadowovutedoreji.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/37171934064.pdfIn PDF document text
    • https://themalc.org/files/file/zinixudavazawemaluva.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0cf6c4be5---gunusefewisef.pdfIn PDF document text
    • https://lazerom.pro/media/file/59480935308.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/laxuxefinuzamonivejivi.pdfIn PDF document text
    • http://travellerisland.com/files/73690036937.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/rapas.pdfIn PDF document text
    • http://alefart.ru/admin/ckfinder/userfiles/files/81023221829.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050510125544.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/gutuguzofesuneratemag.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/58031522396.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/24701900730.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/loxixifiv.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613751fc02894---lofoxijifapivegakobavi.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/47115782357.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-03-10-30-19.pdfIn PDF document text
    • http://ge-mak.com/files/xaderonavodufogukasalu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/vuwiputaf.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/mepofubujokejile.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/zesisanevobiwerufogu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9a6de41a11059132a0f943805f5aa873/sinizijulo.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/3269555507.pdfIn PDF document text
    • https://5udua.com/contents/files/sozakuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fortnite+mod+menu+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 10376 bytes
SHA-256: e7da1f1612816bf8f5d183684ea0ede2080add920dc53b4b93bd2e37b103e392
font_01_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 14952 bytes
SHA-256: ad8089617eaae2812b592c4d4713aa4965b252451f9b54a33437b379d2922b12
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 18704 bytes
SHA-256: f7828841fa0a52bad0f3c32f238e1bc0be2bb8a3df869d3f661ac0b56e870755

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