Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109757bbe4502bb…

MALICIOUS

PDF

84.5 KB Created: 2021-07-20 11:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 901c25d789763d30dcd14b95c2783823 SHA-1: 4785cf1da42953044946c62e51aa84f85ac5027d SHA-256: 1109757bbe4502bb3587ef2b115b4d70739cd8e07cddbe84c0a2f863d8c3c3d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--b1adcbbai1bezln.xn--p1ai/content/File/vujepokerafepum.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/periki.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3c647c8243d11faa6b09b2b8c5a6de25/nokaroworizowiwejajuva.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-14/20210714005856325619.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/pefolovifuvakugofasuf.pdfIn PDF document text
    • https://avela.md/userfiles/file/lizokoko.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435251d452---nogexovelukajurigowebo.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/48307866730.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/86061892335.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/711bb033b6c7b7eeaa014006afad1470/zitaxejanurisul.pdfIn PDF document text
    • https://edarky.net/data/file/52570994620.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071407425880554.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7voi2aeq1mg5oclqls2ueldri3/gotuze.pdfIn PDF document text
    • http://faradbox.pl/files/file/mipepelakutaxubixonubad.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c922458d---33243149753.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c461c760---172177449.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/274524573f3c6b78175bd0ad0e50187f/3294448763.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/18330514368.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/2538776474.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c21856ac3---40505959279.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba907e7cf98---29978724991.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/refkl7qitra7tp6m7ain3lmkbo/72856893139.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/ruliluson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=germination+of+seed+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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10652 bytes
SHA-256: 21077761c6e2843e99b98175ab2caebb1dd17e59b42706dd3518a2efa6fef029
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 17208 bytes
SHA-256: 003adb1fe549d56c284e5fb9aa041020afda8ac76fda73ee3b64d0d639bda690
font_02_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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