Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab515834334f8061…

MALICIOUS

PDF

86.8 KB Created: 2021-07-12 22:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e305ca84dba3303d5cc6f3c307ceb30 SHA-1: 41e79a27625d526fc595826d38de16a7da4f24ac SHA-256: ab515834334f8061bf571b221ad49d308772a713c35034bf676d9ed8c4e14986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=can+baby+bearded+dragons+eat+watermelon
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hd1r607h0f66j10gds2h76t8g4/26395348164.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a411f66e5c---83703591566.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc8510cc0c---kiwafogefawubirakaxutubas.pdf
    • http://palaciodelosnavas.com/userfiles/file/66368894085.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7hte157u0d2g1hikf5ugfai2k3/vowesewabesozu.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7aa7b56d69ca87e73e749b5ab67b6326/wugitijuletawekuwadiposo.pdf
    • http://vervesimuhub.com/userfiles/file/pizumukexixuval.pdf
    • http://e-sportis.com/images/upload/89821918244.pdf
    • https://morganmethod.com/ci/userfiles/files/9633054663.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/57636031806.pdf
    • http://www.thaiboat.net/image/upload/File/fiwewinabovire.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/92972054062.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vasikeda.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/nifomorowuwelunajisoko.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160925def96249---vasubozazunanuniwajita.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093c879c12b7---2996416425.pdf
    • http://better-pharma.com/images/file/files/84438536184.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9505fa91cb---24696618066.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c12e6723---razojifi.pdf
    • http://www.39koratmachinery.com/file_upload/files/75707434166.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160723ce6cc330---10885368094.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/58d14241f830f856f36ce35e245647a4/komemiruvewesuzuxep.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765ec646d20---fupibipavosuwusenukot.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ngj1r10v8pg1qumlfbhm7brsv0/tozedinitegogosew.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b8d7c25d565444f4b57020d63a50acfc/supudif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe3.bin
b94ada8d6f5041603c97e05574821a947733b15bae1151e819dbc349f2212fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10868 bytes
font_01_sfnt_off000108e6.bin
d34cb6754cd5dc202f40a7560e1c95049719ba57f07e2a4c4b646e8f4978e0a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 17124 bytes
font_02_sfnt_off0001355c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16792 bytes