Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1773223c2553669…

MALICIOUS

PDF

85.6 KB Created: 2021-07-26 10:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e66eb502a8ae15d0e349d6384554456b SHA-1: 3d7f1fe12b0ac2176b0503d504631b34822dbce4 SHA-256: e1773223c25536693f181452da1c16615d157b5dcf72f3deac0492be134ce9c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL findings point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf71c86cf5---39055384613.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1v2g7kmv2kkkcneqd7pqkl44hf/lemisum.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca58bf3ec4---28259233620.pdfIn PDF document text
    • http://innersolutions-uk.com/file/85093242642.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///razilovomotuwowufunag.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b14ee1876---kokigajejiniminomasolag.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tafobavalerezaz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/53935412563.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/nanobudimole.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb43ba7247---damug.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/lemewuk.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b0328033b3a20e77d748399b1bffa5c/16905148721.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/31719610941.pdfIn PDF document text
    • http://langmypham.com/luutru/files/tugirijava.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vebotubodixu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wotepasewasogoso.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510175038991992181.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4a4192ae4a6a6db661a6cb35a191022c/mevazifubewejojepawikaw.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/17447779309.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf050fca6---83553485372.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/besomofinidezanum.pdfIn PDF document text
    • http://poorclarescork.ie/images/18049513220.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9adojaa86ligdub3lfr52evnk1/kugijufefibidofufeg.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/mebator.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/66372942159.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/10076032201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dynamic+documents+with+r+and+knitr+second+edition+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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 11232 bytes
SHA-256: ed15a85b44be6d556689a97997fc0cd5ba5685d5aef990dccf23d121c1169814
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 18184 bytes
SHA-256: b432d2fc1b7b1859b839f40bd22a5bf43732028f927d57d26739ae9acfd62849

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