Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a50163c7b1db08…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 21:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c8880eec89b6b70f1af76c45fc9bcd5 SHA-1: d79400c69f2d51802a204e719574c180febd4a7b SHA-256: e3a50163c7b1db08280e0a5ffafd9161b95e3deeb36ad2835babdad1a545e282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The presence of numerous URLs, many pointing to potentially compromised or disposable hosting, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nstoplana.rs/ckfinder/userfiles/files/vuxekebidaxiso.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4793acf---tinatezepozanajapijipitim.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b9150d48123---wibagisawebawagaranetezex.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/64173641236.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba2f37ab5---76197321580.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210721044620408.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/gevaruzodavapixa.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/koxijumowibebude.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/tilotexedevawefalamirex.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610058479a4f3---87973989213.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/11c834e1b4aed9fa66a599f152aa1443/79077944304.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/90178135504.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pqhojs2n23po20ov301q76j2ce/81818014077.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076c399d1ab8---57914504843.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9oiuu2h2cdt094lmethc9er23p/96599406366.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/38948262768.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/katelawavuxurenef.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/23373239182.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f6aac6fef03c882d55d9da6c082570d4/56950880084.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607429b5db2f3---72023245447.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/71904998583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mercer+quality+of+life+index+pdfPDF 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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 18676 bytes
SHA-256: 5e3b0c62b3a4881c423b22db1c3e67bf0a0e4b6aca43150fc926372ebf61ae27
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10900 bytes
SHA-256: bf24b3e3f099d5ab34b8305fd0a5e9fa5947a898ea3e58a9b264643111d0a327

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