Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d39288cbce9a5a…

MALICIOUS

PDF

105.7 KB Created: 2021-07-07 18:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a5cc19862bff1ba407b1d01ad60ba0d SHA-1: bcad935a6e5c4b5f722e6ccea053a81ce2e01cee SHA-256: 41d39288cbce9a5af4251303ecc0c3d069d11a5179d6950bdcc6384ff2092621
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://murito.fr/ckfinder/userfiles/files/85133713591.pdf In PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/87902647059.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966eab316e---54501438472.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/64575325070.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4e74jlpp6daro2hugru3qs4qup/48806128473.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c321fbf---bosoxozififepozenikezunum.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/bidutezetunaxogugavoser.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6cdb9fcc6f6dafb93d0a87864440cded/sijoxevakusu.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/48155499437.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70590bcd5---rovor.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff70ce057f---binosavunotuzegovopirosux.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t1s1ae4bp7bfbb37t4rlmcbnq2/mepavafiwusidusojit.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d7026e8642f59c7d66a1926f0381d355/26395544412.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/21418304798.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/solulumagakuvojazowofap.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609830a88b9b6---77888558958.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb9d636a0---sabejedelax.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3d0a92e4---4634914018.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a1efbe15a83---vudajekenidikiwafiz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zagif.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/75107084812.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/mamoviso.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/899026a11d44028c0cdc5eeb0e961fae/29553175340.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/81573554934.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/46223997952.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d18974dd601---fodumoxojuwibajetoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=streaming+film+fifty+shades+of+freed+sub+indoPDF 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_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 18844 bytes
SHA-256: e77667d9ff734937a58522de9423fcde2e75e1e4ce9b96c41c3f0530bc01ebd4
font_01_sfnt_off000166e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E1 11232 bytes
SHA-256: d37252dd345b4fdb1b5935d2d4ffbb00ca7a357cbfbe6bf8c186683291091cdd
font_02_sfnt_off000180cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1