Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e34f434e7093ddd…

MALICIOUS

PDF

86.0 KB Created: 2021-10-15 05:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9fe9414ae2e25b1e7da5f817ad0fa01 SHA-1: d0d4292dc6c89b9e9969b201315d3784b69ae1cd SHA-256: 8e34f434e7093ddd416768b008c197a0ca2a6f4193f744c8ece048434d152028
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=fixed+on+you+pdf PDF link annotation
    • http://mintaialuminum.com/d/files/40867887218.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/60536248605.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/52024022979.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10396602730.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e011396c5f---58426517991.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kokuzemutepu.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/17996486205.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/kusitif.pdfIn PDF document text
    • http://sieuthibds.net/images/files/65478491845.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4b7034cd1f48f1cd866fa35879e43b83/37209120230.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fejasajopukipofanirut.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615abf2d86b0f---batofipawetuxisosasilabi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosufetepiremufowizudev.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/leronapurapunoxevibanago.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109181858341519.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/33031245551.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nizimutigu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/85363246552.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/95939322240.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/joxovegozazesuzogozamo.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/63893699760.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/kuzaka.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vubafeja.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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16876 bytes
SHA-256: 8f8166aaa5f776715744d0b61b46a3388a6aa3707d94872d6219c910216f25e4
font_01_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10208 bytes
SHA-256: 8b6ebf6eda3e861d23cb55bc8e92ee656b83fc76ef04122722230a3740037f7b
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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