Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51a65bbe17d3976…

MALICIOUS

PDF

97.2 KB Created: 2021-08-02 04:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 731f7d3ed7654f2e5fa50ad43d5b63b0 SHA-1: 8dd81a7368e4f9644f33a64d900c19aba6134649 SHA-256: e51a65bbe17d3976518b8d387527ad03bd4c07d41461d9a2dd99988fccb981c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 https://wastran.ru/uplcv?utm_term=how+to+make+a+replacement+social+security+card PDF link annotation
    • http://divorce-difficile.fr/userfiles/file/rotefugagovotagilejerawi.pdfIn PDF document text
    • https://irantruck.ir/data/file/mutapod.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd5c4d6644510c4043641675bbfd062b/kulubakeditexumokofo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/susuziwonisamowura.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/44371348913.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608666315b4f2---83076267771.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/bolojoxigefofedunoweb.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/31150865233.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40d73a3265861c8f632bda7f63c67326/81682502958.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/39426266602.pdfIn PDF document text
    • http://ligneus.hu/upload/file/42985624768.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/66589336857.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/3100038662.pdfIn PDF document text
    • http://expresskaliski.info/file/xolabu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/67576553636.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mozemison.pdfIn PDF document text
    • https://brod-plovdiv.com/images/98656473779.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a4649d5b5b7---vamekudoz.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/50499839787.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2925769a659e7ad8262dd6e8f528a586/wipani.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702134137693.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098995fb09aa---60471152576.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/886p1t7s9u4upcdc4ooeqgso6r/18684933532.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9cbos60adrqtfgsirn3f7t483r/rozame.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/6302020174.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g6dasna67lr8erq43bspoheo8i/vevufubemujobelimej.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210624033810_f7e6c.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_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 11060 bytes
SHA-256: 01dd6ad9f46bfa9e550ed134b7411e09e13265b88d77e72436f83b7f7b32f70f
font_02_sfnt_off000145f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F7 17744 bytes
SHA-256: 55e48feec0a68efbed0f850d8d0186d6a1755819a13949deb17aa0d433683fdc

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