Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4005c2f7280b2a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 03:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d0154daaf2109dfe9d0cca48482bd9f SHA-1: 0d82e6eb9bdbf54b57af6155db3a07a72ebd61ad SHA-256: 1c4005c2f7280b2ac38e08a6c9f6572f30a14b42a748b3e40b561e85c46d36b3
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mueblesdepladur.es/1/userfiles/file/19656204099.pdf In PDF document text
    • https://msiutilities.net/documents/netebatuloruli.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/mojejojupepu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/jedivipi.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/47598846831.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/5740544344.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2591e06a.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/52121617455.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/viketudusipagapunu.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/77614418107.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zikupuxapabagulaxoteka.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lekasif.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jebubibowujupeg.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/20956361878.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/zesiwivowabaforogavek.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/70356566308.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/77457193684.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec6abf6ec---malusawanuxalo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e493de26c4---ponozagegirokevosasij.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb8468c712---xosujavogivimofejobidu.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/buwojazefukefe.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jarvis+pro+apk+crackedPDF 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_off0000b0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 10408 bytes
SHA-256: cb1bd9da56e8ed937d092bfa7e5a82ccc2f9ae7cb0f7205630b9325e73e2ab52
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 16872 bytes
SHA-256: f030b2ae243f1b01b9948f1255fa2a75306fcee2c6da6acbda4d9117e1e4407d
font_02_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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