Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4ded1805c26ba1…

MALICIOUS

PDF

92.4 KB Created: 2021-09-20 08:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a16d2fa5d0d8acf5bfa6942d6b65e50 SHA-1: 768e72be6f133e39b44107dde5b2dca832fc5575 SHA-256: 7b4ded1805c26ba1cd8771921a509af616ce446ae7da7e1e7ef91c3b537f5871
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or phishing. ClamAV detection and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dikegisanuzuresafabula.pdf In PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/15011763593.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/xusuga.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/nubutixi.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090923422055.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zopaz.pdfIn PDF document text
    • https://shibbirs.com/media/files/gofodo.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/56853819597.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccd32cf38---barifokute.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/88699813751.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/volodaromu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cd424bb2---lulepemudowasuketop.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/19745787271.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/mudufipepedivejativajibuk.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/neremunapadazufajiden.pdfIn PDF document text
    • http://cochemical.com/upload/files/joriwevaju.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/nanugegup.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/65549150172.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jebizilugifotoneniwu.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/vozidoziwavipufew.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9dc85a17aa386069621fb93c209d58a3/77572819165.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b707d5852---vofuxofas.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/55429585675.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rofekegakezo.pdfIn PDF document text
    • http://cartopack.com/Images/file/sexofebisixofiwuvif.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/zofigexodigesojororolugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=architecture+software+for+androidPDF 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_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 17352 bytes
SHA-256: 62228dd1e1c28bdcc0d371e6910dbc6c0c5166de1a2ac6cfea626586410f2d0f
font_01_sfnt_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10692 bytes
SHA-256: 458790fc9a0acac8bf4eab8f45b071f19d6302ea9780551a53bf5a5d39b549dc
font_02_sfnt_off00014bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.