Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66b943402e60274…

MALICIOUS

PDF

111.9 KB Created: 2021-09-04 11:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f13e8e87306e631f9031209271082193 SHA-1: 70b7ece448a62f72b3830f294410618607b90b19 SHA-256: d66b943402e602742d4039fda8676703e8608087d8ace65929eeba336970f34c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 5

  • 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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef0b58267---gezomafulisonale.pdf In PDF document text
    • http://euskararenginkana.eus/files/galeria/files/1301901919.pdfIn PDF document text
    • http://webbuilders.com/files/file/zujujigifofevolusi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xegevosiredujusufopumire.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5ba6202d004f58d3d06fcf7588cb6a9f/suvawero.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efef3abe0---dixolakadaweneli.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ff7c044c9---84847229550.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/q27pfi15rjpose64oile6l082c/sisosoxevitagage.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/19140905357.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8b02e54c5ce784ac249505bbfe45a127/masepofatirapafodu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121938866501---wenenugawuxiguxufujepako.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/bixovozidigalewenizejak.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/rudafinamopaniwubej.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/6075717815.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gn96q9n1g03e5t24v0bih44m3/zebilebujakujotetepeseb.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xupowosonebix.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2103c981252a29bf54bcd442409c206/meluvajexalixufunufajiwo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/98578989001.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wolezapop.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/rawikogaviganijixofidu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0a16f8e2---8501511176.pdfIn PDF document text
    • http://traviet36.com/upload/files/76499463944.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/41892869417.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/fobebidisixatogi.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/23673735823.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0ea69a089ebc6b9d753fa968f90ddd7e/vebafajunofareruxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=open+specific+worksheet+excel+vbaPDF 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_off00014f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0C 18772 bytes
SHA-256: 3f701bd373a24ce99d691ad2db67304eecd1201b688784ea0cdc5e486ac6dbbb
font_01_sfnt_off00017fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000197df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DF 11088 bytes
SHA-256: 2c61412c2104f911c1d90766271361527bab925011e4e62bfe67d8c0d44cde5a