Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cbb7a3b75f4c77…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 13:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2dad77743a25af9b0f77811be62ac827 SHA-1: 8ac891253fca78f692087fa13f44870c8f9a3013 SHA-256: 55cbb7a3b75f4c773204c4e0c961f3b9b6ac5e2cca435ac4fcb94f6a92084ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to potentially compromised websites or 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 lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://psn-monolit.ru/img_file/files/35381534391.pdf In PDF document text
    • http://movementlab.dk/userfiles/file/mubewikenisolatunij.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qg5bovv4u4i8g9aohhq6adei0i/50010570470.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/vajijek.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ac3d584471dfc88bdd7c839379aea0b/sodemenipud.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/89971331855.pdfIn PDF document text
    • http://sinhadventure.com/uploads/file/14027197150.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081088110266---wavunekazozon.pdfIn PDF document text
    • https://totounited.com/contents//files/25225846234.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927db3b249---53620932731.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0020ded40d64efbb4db2233d766a235e/rubokixe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8aeb1f81c---21043374372.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/597967f40f1cc5a2710a5839f1fbf2b9/jaxogebixamafuzoralu.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/sabosijunebexir.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f9f4a8a29---15305863903.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/26108238792.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zadako.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/87160029147.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/66809231447.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/bufuduvubovut.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/nunekuluxuv.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/97068095564.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/62174596250.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c1a6498a---wonevonirivun.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xegufegidanuwefutemasev.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/74336426556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=les+fetes+en+france+pdfPDF 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_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 10312 bytes
SHA-256: 961c99419bafa911e3d8315907557efa195f3bf2912c72594263540dad5db54a
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 18352 bytes
SHA-256: 8e65d7efcf17f2090efe4b757377f9c3d6fb8ba6529f06821ec77754e476dd6d