Malicious PDF — malware analysis report

Static analysis result for SHA-256 e159b26176d1e4da…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 22:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4d7d7ad0b722c9ca1ee862ec41c7e3a0 SHA-1: 309770dd1f9ea33d70b2854ac79363af24e67bd8 SHA-256: e159b26176d1e4da9b64da678f943aca700e00b51fcf17f4091ee8a254d27c24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/sisexotosepoxijir.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/dewekenitedis.pdfIn PDF document text
    • https://airbays.com/userfiles/file/gobabidazefabuxosev.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bnba5has97jnio9dis3iuo3cff/talisubofovulapixezirilo.pdfIn PDF document text
    • https://membermimpi.com/contents/files/lulubo.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/tijisirodaziwemaguvujage.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb517bbcc8---30647713966.pdfIn PDF document text
    • https://andana.us/files/files/82171651904.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/namefuwunulut.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nofetima.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/lujiwonojizunejej.pdfIn PDF document text
    • https://basisangka.com/contents//files/dokolimipeto.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wegaxifedodibamemejure.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875521cb205---40036970461.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/64931976813.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd16f26dc41---zakosegujosofusagepuk.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/69797923064.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707df8c824b---49001516336.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/raves.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f39267952---pubebilo.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/gekajopugolu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cdbf49d74397fea4bddb659e20cac951/dutuwazitovotuzonaxa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e056d1b27---jigukepumorimafobubeg.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/31431437003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jaher+vahivat+book+by+kazi+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 10976 bytes
SHA-256: c17e48c2f1e6efc58a72f19c2b3bb36229ddb9937e62abd77e6f8f1ce633042a
font_02_sfnt_off00014bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF2 17668 bytes
SHA-256: 56d8abed069c049fac776c4d2dc84b5a6c7e0a0500052c99fd11956ecce88344

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