Malicious PDF — malware analysis report

Static analysis result for SHA-256 97daab3dcaf78da6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 10:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2014e5a3bb7433052e9282c266e7d3be SHA-1: 87fe8c35d004ceb285bfce79820a8c0ec43c1a6e SHA-256: 97daab3dcaf78da670e4e834096e34e0dcffff76c2cc0c90cc939a2144962e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=find+my+midwife PDF link annotation
    • https://haysalon.com/public_html/userfiles/file/83986854506.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ae6f7b492f960dd4f5692de603785533/xotetarojesibasogojemete.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/parudef.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xiluwelaxiwegexinopogufe.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/68953590225.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021081517153697.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/r1pvg82cdk1hb7kdbof8dvn78m/90689874341.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/4905050315.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/fu2088b36uqpfqou9ru62lap87/mavivotuxatedimule.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021073112205773499.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b35314d4---50778856980.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/22531652605.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4263ad3cb7db0e8e3ff6bce5eef2e9a4/60849970413.pdfIn PDF document text
    • http://denge.aero/upload/files/30765105025.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/31187302315.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4mvho3adormhefjdse559f6be5/12268855519.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/foxafikezeb.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d69cd5aa---3271701026.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cfdb71d3---13962387846.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/68954319750.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16128e26ac3f6c---27031196337.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/81689658572.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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 17184 bytes
SHA-256: 0593d050420d7215d9b736c120bf9517b8980867b8cf09ba6a66296cbac09427
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 9996 bytes
SHA-256: d3c45b295e396fa7664b36c82ae407ed15367c8f6fc4e19838d0aa4fe47a9523
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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