Malicious PDF — malware analysis report

Static analysis result for SHA-256 7536ae178dcf42b5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 13:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d94ceae1c3224ed48b8f560e66fb1f6 SHA-1: 9144444ddecb3e27d9ab2fbe674fb848dbde11f8 SHA-256: 7536ae178dcf42b5735988ab30f6de4b2cd5af388e56c0d7e26184a1f4c15ec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests an attempt to direct users to malicious content, possibly for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dailyhondaotomientay.com/upload/files/73136513971.pdf In PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/dizateguxezebor.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/24561032587.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dalabenuto.pdfIn PDF document text
    • http://bjjiffy.com/upload/31902022196.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/27015178380.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46870902461.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/feribopubu.pdfIn PDF document text
    • http://sns.hu/_user/file/difetitubiluremolut.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19176288529.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/30035853230.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/85240822167.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/10352420763.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/fawutovuxorinapadivas.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb044d63---483155634.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/14511109369.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/15370dfaf85d8301c443f03ee3f6775e/20599508370.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337e86ef70d---nufazesuwemomamosesexegov.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb6612845---tivigetizataxirotibapaxi.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/6639350567.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/kupedegotugupesewugura.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/8450364304.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/52533076378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dog+man+brawl+of+the+wild+read+online+freePDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 17804 bytes
SHA-256: df839a53f9e405442db82f54f1900b2ad61bd1fd9105fb5004d0ced4348d0276
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 10860 bytes
SHA-256: 4f39369138283eb16dfb80f005b55e68f7c5e135491eca6b719ec3bce7d2b344
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1