Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2264a6fb8cde80…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 19:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1d4c48c83624723b1e09598e7f9e09f SHA-1: 4b96990f40bc0465d5a4309a38cde75de936def1 SHA-256: bd2264a6fb8cde80adc80c2c547d6f7fd12bff4424466bd5ad0cbc6da89bc129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=o365+smtp+configuration PDF link annotation
    • http://sp3siemianowice.pl/userFiles/files/63300412905.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/dezina.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jasetawizogadi.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wupiba.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f901df2800---kunaxofereveka.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rosevuxune.pdfIn PDF document text
    • https://ijp2.com/contents/files/19745312332.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630651018.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/293397661c9d7e2a0a601ec70a439ba4/sirixasatarumema.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/mobolorafa.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/96993995707.pdfIn PDF document text
    • https://europartner2.pl/uploads/dumaximinolez.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/9221318602.pdfIn PDF document text
    • https://pcetravel.com/files/file/mowolulixif.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/111c706e8ac9071cf2c0d9c272eab5bc/40972496144.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/rokevuvelodiwapevuzane.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/bofin.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zopukujirulawiporokuwevod.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/pubabubojopaxis.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/67627115312.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_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 17764 bytes
SHA-256: 4c5c753e9fcc914e8233c4535f8bf3e10b13b96f89044e7c32f838e57b709fb6
font_02_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 11244 bytes
SHA-256: 4d3d1b1024073be8a7cc374c659ef02b4e9ff41f823654ffc2764ab22928141d