Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d213ff0d6c3e54…

MALICIOUS

PDF

73.4 KB Created: 2021-09-30 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 322535725c97bf496d770a5b72e35f78 SHA-1: 63b88e60745767ed9c25a47e65abe3b463662f7d SHA-256: d9d213ff0d6c3e546c7146cbd90d5c8541b45fd8c36e6b68a348dc9dce8dff70
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is designed to lure users to compromised sites for phishing or malware delivery. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://suruburi.net/mm/file/jikuzixatenuwaxes.pdf In PDF document text
    • https://szekszardportal.hu/userfiles/file/39618367017.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0364710001632608672.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/32762521838.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/66056166935.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/sixivirijedigamo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/55091696958.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e1724c5b7f81134849af16f71181ae7d/94263507899.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/29527924953.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139055772d0d---46744389440.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/33930108579.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8df55eeb3681b3b839654872044297cc/12364323187.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/wafoxobedukugofutapugerun.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kesebizubavidazawa.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lunuwikoweguvotuzi.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/4663597259.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazudigejadexelunop.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/56728962230.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/760437e31fd8bfee13ac39076f5fa050/79502071873.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8b18bcff03aee3d21a8550927ea41932/jipazube.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/60925347662.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/5241995051.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210922_25D0FB924211CB26.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16319931408118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=micromon+adventures+downloadPDF 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_off0000b78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78F 18228 bytes
SHA-256: f6305fe106746b55c135472e06a046823f19cf97a4b05ee00e24c46d4c15051f
font_01_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10776 bytes
SHA-256: e85b68f8131836d0722c5b2e13160ed0d979bc75a4d8100940872688c6c7bf99

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