Malicious PDF — malware analysis report

Static analysis result for SHA-256 003bc747b384bbea…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 11:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1af53c49ad0f03d06a2dc2c1e5a9b444 SHA-1: 954138b0e32bf0b84536c9e8bd4b4c21da841760 SHA-256: 003bc747b384bbea7cc9a5b2a515a308242ba2877aa4d045cf2f7d11b3c5aaf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Numerous embedded URLs and heuristics indicate the document functions as a link farm, directing users to potentially compromised websites or malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=kingsman+3+streaming PDF link annotation
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/zebexujokefubekafeb.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/ninebojosasime.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021921352156719.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/62797660216.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/15007795664.pdfIn PDF document text
    • http://rhondachem.com/d/files/wuguluvusexajobapojijana.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/xepidasowup.pdfIn PDF document text
    • http://domario.ru/userfiles/file/42531787704.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/00e384cde264ebc961759676e9fedcfb/nogis.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nofilalikut.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137db75a1e2c---pidolaxajovebubupinab.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/14068399333.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/98262903129.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/35052821157.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/54e6a71d01d154615b2fa3e818f8b18b/zopinarujubukevolefa.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///zurobogojivomigavinizo.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/47743952399.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e15b4a49a---86489616448.pdfIn PDF document text
    • http://savemaxint.com/files/file/nusevagixazivobowubi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/81058513117.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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 18428 bytes
SHA-256: 6721b1d425d1bf42d2bdfab794ed4417d62fa8935ed0ddbcac8b312746f110e8
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 10448 bytes
SHA-256: f633390dbceb2f151dae1fbfb3beeab10f8d0a37998177327eb20ec6ac63734c
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1