Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1f725d0add1818…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 22:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 327ed796b63f27264f9ec7821b510e27 SHA-1: dadb6487ea2cdd81ea07c1bf731c937b68515a2d SHA-256: aa1f725d0add18188872724164b62f54dab547b155fc75e33bc9c9c323fb6b7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=kuwait+country+profile+pdf PDF link annotation
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d0205272---56161393874.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/18293069459.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/43582761981.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nlck4oenatgrai48m9t27mqmd7/wonuse.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecbf661b14---22634106441.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/barunufinage.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/xijepoloni.pdfIn PDF document text
    • http://quinta.cl/upload/files/57207076731.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ks4lsv3h8voqc4ropdsisqsa45/kipasubunorosegidin.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee766f279e---43023606280.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/88187823015.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7fc80a8d9---28707510496.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/depakilopixesikud.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130420c3fceb---68691793746.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b29874c60---vunivepigo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a96fd2d498---solidojorurupedasatowupuv.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/babufedexejo.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210710_FEA77264282A000F.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/99682021116.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/suvugimi.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b30a1bba3e2abcc2be79883a348f1c28/fejoxagujo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec3667a3b---wizaramunorobapufuw.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/99144554840.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609790fde0c06---70108746092.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238f062d0c9---sufukosewefijegofinovudu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/86701822498.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/34126340155.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10736 bytes
SHA-256: ba27dee47712c81c6e04008a2b41aea2619feb1008740dbb02863c74d1da51f7
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 16800 bytes
SHA-256: 5d3ec855427e837659fbf23c13392bed18c250f42625aed5896cd88df7d69e5a
font_02_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1