Malicious PDF — malware analysis report

Static analysis result for SHA-256 e365ba4c51e3d428…

MALICIOUS

PDF

119.7 KB Created: 2021-07-04 13:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c676c89c75f069cd52cc03c808ec4f5 SHA-1: 8aaa3c3bd338403696193a12affd7a53e6f3da70 SHA-256: e365ba4c51e3d428349699ed8d6b1c3ccf155b59a9096d999baf2859aa4129e6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple URLs hosted on potentially compromised or disposable domains. The primary goal appears to be SEO poisoning or phishing by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aldurra.ly/images-editeur/img/file/11344202504.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174aaa3bb---sapuvalitulop.pdf
    • http://smn68.com/clients/75339/File/vefopugamujidogev.pdf
    • http://sattamatkapatti.com/userfiles/file/bevajofazogo.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42df6025f---rixofumesetezi.pdf
    • http://muszempilla.com/files/file/rumam.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ec4265237b1eca15532af662d7ea2d8f/nisis.pdf
    • https://agrilaui.com/userfiles/file/14299507059.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d5def23f2c1ea3b4c8a401d03ff5672e/12418836652.pdf
    • http://petukmahaaaraj.com/userfiles/file/tikalomun.pdf
    • http://cutencuddlybreedables.com/_images/file/46549265948.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e33042a---bukajoxubojelu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b4ae6aeb---70720831864.pdf
    • http://faxik.ru/ckfinder/userfiles/files/70025800440.pdf
    • http://dinskayarealty.ru/media/file/73366987605.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa61c5061---42700518018.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662927d228---juvujogopopufotevenerax.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/22802250094.pdf
    • http://sanruou.com/app/webroot/uploads/files/dilikirut.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7mp244gk6p0gbmnqdphn6fc6uo/72863853363.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//farudorajep.pdf
    • http://kraski-chernila.ru/resources/file/51059536440.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1itdamkrs9bki6up8icl6fglp4/56317340501.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+delta+mean+in+financial+terms
    • 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_off00015f23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F23 16792 bytes
font_01_sfnt_off00017735.bin
6d2310bb8e943fd3a704c2f0a33cfc116ca15c62c06f2847fa6cccb07f009e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x17735 24060 bytes
font_02_sfnt_off0001b721.bin
f112e861496e7b96ec461e24f1d5aab348659cdd8bfb56e56669c1cc076a3473
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B721 10732 bytes