Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd15f14f80541d4d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 05:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fefb92f90f7baf62275b1dfc867c754 SHA-1: c40781c33d2515120fa5b113e0fb41dc2edb9562 SHA-256: cd15f14f80541d4d66020ffee144ee28fb8e0c289360c7d7320c4ee6acd81321
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 ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://manorhair.com/uploads/files/202109170619336371.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161482d4b3147a---40375300813.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/29117051681.pdfIn PDF document text
    • https://panama4d.com/contents/files/43726163409.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jaxofuronevojevitimu.pdfIn PDF document text
    • http://beiks.info/public/file/70611855723.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/90192239896.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/xewix.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/64833187295.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/tepizewiv.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vadubezumavumud.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614299175bef5---38288100005.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/nukikavuwivubamolikaw.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/346539055613c5619e0b33.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/45993423476.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/73791146708.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9833f19252ed94ff8c8440fd116e9d53/sotiretojabodiv.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lufilemomuxiwebagak.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/kubejoxojol.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/88931717878.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9f3af65b---tepivuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+reinstall+phone+app+on+androidPDF 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_off0000b5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 17128 bytes
SHA-256: 156034ee315ecab8118a9f8718452633eebb5bf47a1aec12a1c1bfa2afa5c2b2
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10568 bytes
SHA-256: 8b5101590d238fa138333a00351730eb5c674435263b39386c6fce6fee9ba647
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1