Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89dbd98f0592445…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 21:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33f84f959a6cdf2ef03ab8da02b35138 SHA-1: d08ba7b59f326010e94aa05fe03d9efb950eb9c4 SHA-256: d89dbd98f0592445f8c346abeddf788e1e6c64eae69ae0065cf0ed65c5dfe6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF link farm heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://geometramaurotozzi.it/userfiles/files/57946306458.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5vqrmc3vloa94c6jpudbm6j5d3/4847018462.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/96601856535.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1d6be411f5ab60ed57b0b395a1bbd713/9438101782.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/bebegupamotanurajigajodo.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/84621849196.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/18074273905.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/kuveranulinipevitiridije.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wofasol.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/lumomelanofopolewu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147181f6e7a8---49822589597.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mibufolezabopubuk.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/lowafap.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091803540284.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jofab.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/76677914336.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/69159333883.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/41058032273.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36587542479.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tawax.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/50811876262.pdfIn PDF document text
    • http://01host.ru/userfiles/files/41405348912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+notes+appPDF 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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 10320 bytes
SHA-256: f88bd92cd1877cdf83f978ae4bb44fe0134ba1744b27a6e172c2fd5e412b52e8
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16780 bytes
SHA-256: 7753363719ab1094879a7eb4cc29248ec52ca4ebfc266739f77852e41069abe5
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1