Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1d30a7872cd414…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 00:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 76c1a836ba96f4f361cbb64936d9444f SHA-1: 16a0278668f747a31e751962ac3311139fe2f051 SHA-256: 9e1d30a7872cd414a347bb8b545823133fc88c5188586554b59d0d04d740d2a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The primary function appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=hide+video+apk PDF link annotation
    • https://webmakler.org/userfiles/file/lanobu.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109070610147150.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/beguvedodel.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/kewapudunago.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/46381577031.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/fabupurag.pdfIn PDF document text
    • http://afslab.asia/upload/files/53731320917.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/19911550930.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/80624726418.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7e7c1cf0210a9f062325db27e16c035a/zugezaguwavopufenuvetuz.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/16022443533.pdfIn PDF document text
    • http://lukinserv.hu/file/55382981145.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/76152827416.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59aa659bbdc177e60b765f312632eb6d/bepusiriraxutedif.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/juvopalo.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/96323986237.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39740375278.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73798431372.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/rijefabajozasotigid.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/kuwililuxawutuwisojo.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/52142845497.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wopojokazozejonakibiga.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vadigapakapulajalebojaki.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/38701597470.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7bkbkq1cj7qc7ord0dmfsnc4k0/18169591654.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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 16880 bytes
SHA-256: 748761402418fa027cff52c648ab2eb15aed080db0b6159058a2eec2dcc99f26
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10016 bytes
SHA-256: 043941eb6434ece8aa0da6e0b45ab0834852918fb8265da011eb1c516c61049f

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