Malicious PDF — malware analysis report

Static analysis result for SHA-256 3419e1a3075e6489…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 16:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 258a5f76a6029fc68d91b99cc38e64da SHA-1: c9ee0877f0e1bfcc69e481dcd071f93a8b60c1d6 SHA-256: 3419e1a3075e6489ad8b853d40e5bb38c764ab0851501ddcbc8176edd5b8d8df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://studiolorenzino.eu/userfiles/files/zixodiwimadewu.pdf In PDF document text
    • http://moderncarrent.com/user_img/files/moduwaj.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/27043408838.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sulizilofigokuvuwekabomos.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wowifufagesazofekowuruzaz.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/karodiv.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210912060927.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xepofotuxat.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/80212586212.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/43293186061.pdfIn PDF document text
    • http://vejwun.cz/images/90561819572.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/56802882224.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fumeb.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/saroxofinogelafekir.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62960916286.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/80885290077.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/68706396514.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d8d108106a80deade65b78aade7f011a/9396778764.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ce6858c1323c8ee928e968a6dc12461e/3579794646.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c249ea4---10937127716.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/18838523325.pdfIn PDF document text
    • https://trainova.com/userfiles/file/84125436517.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gobilotariwurumobi.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/zatozaxadepokilidajixex.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/38109344545.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wotiferelepujubufu.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/78588578521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+10+record+screenPDF 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 17900 bytes
SHA-256: aa8fb827732d54ab75826f2efd5a81da067d009a03fccb85a83942c9628966c1
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 10212 bytes
SHA-256: f300ca3c8022fde3c8e143a917419582a79451a3a39206569681b8ab9c8d0dff

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