Malicious PDF — malware analysis report

Static analysis result for SHA-256 0522a5120619f1ed…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 13:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40652254484a108ccd1e0f0fbaaca008 SHA-1: d83138c208c523e9d7151d396e7b40cc35fd82f3 SHA-256: 0522a5120619f1edc31baa3fd3d107f0e7de425a522ae013df9ee679bac582ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate an attempt to obscure the final destination and leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e155d7b95---jadibowesifaverikegelak.pdf
    • http://xn--80an2aej.xn--p1ai/up/file/muvutotatipitilatov.pdf
    • https://artlabjo.com/userfiles/file/wifavupimafulerugatireb.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/45pv6e0n12lrto1g9m46r7etq4/kepiwukon.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4d57afbd721e45288eabcb1b1e23e1cc/49935051639.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b7b6de5f4---34221249726.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c265c90d3d---95744937252.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607168518b10f---23933444908.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48b112343c---13073878008.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/84d7ea81c7d0652bf181fbfdcc0a02ca/weselup.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c8abe122---bexafiwogijor.pdf
    • https://webtechnocrats.com/upload/file/jefid.pdf
    • http://stark-tools.ru/images/uploaded/29665822924.pdf
    • https://deltagroup.bg/uploads/file/xajojesa.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd86667a85---badeboluzojinazana.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=causes+of+cholera+outbreak
    • 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_off0000f34a.bin
3d3d0271d71eee95332df3622574a93d40a6efa4e52a6d22ab74f41b303dda77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 17224 bytes
font_01_sfnt_off000120ab.bin
69266f069095e0be2996868bfe138211c185979e2429ce01010926611e41f635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 10600 bytes
font_02_sfnt_off00013924.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13924 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.