Malicious PDF — malware analysis report

Static analysis result for SHA-256 523894c876d2fa77…

MALICIOUS

PDF

109.0 KB Created: 2021-07-03 22:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9e086a7ae748c09962038c165eb006f SHA-1: 4c5ce652797a99a5aa96ce7c9d45f17dfb78dba6 SHA-256: 523894c876d2fa77961ffaffc77f5d8cbb83ff32b2d1892463ef7f5bd8f61024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=find+qibla+using+compass
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/686b59e75f36f7ac73b1973c69fc5138/gomoseromema.pdf
    • http://richwoods1969.com/clients/861079/File/letuxusij.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/59946b0e2d3601f5bd2ba195390402e9/34597447181.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eefb3b612---jozupiman.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bb202870b68e47bcbb37b91b91451c8b/90733213702.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1e6qcu044ltep129onhtfv8cn1/84752527701.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cb11b68f9df531f86c3edcecd80a9e9/fanafamararomidomadi.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1673ecfb6e9b953db7c8685418d3a22a/29038192682.pdf
    • http://indel.sk/userfiles/file/vikimugobavasegeriwaja.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce677a7fdd4---jukoxefevimit.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/damexelevu.pdf
    • https://ibrahimkoc.com/images/Media/files/bowonubepuremafadava.pdf
    • http://manixcnc.com/ckupload/files/nidetokuriwunuwiwokemowet.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xavew.pdf
    • https://perfecthospital.net/FCKeditor/file/nuvozuwitakegodelibovuz.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e41da931f---51123960525.pdf
    • https://allianztc.ro/files/file/beditegef.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa475aa6f---nivumasunaviwatemujesala.pdf
    • http://cityclick.it/userfiles/files/21351289013.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f272bb3e---61240338705.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/wopuselebewuretefubadit.pdf
    • http://maszyny.pl/userfiles/file/96392255142.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984c741426b---sibunebefitaporafuzedi.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8f0915e50c347210847a933e03c73454/gemisis.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_off00014676.bin
48832e4bf8cd8c0e9cc6cf654780d4385c57a1ea9001bb07272b010590b28d3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14676 18288 bytes
font_01_sfnt_off00017649.bin
3f83a5a488d9bb6d3c5453e08432cda92a28a800e207afdcb6503dd5311f5649
pdf-font-stream PDF embedded font (sfnt) at offset 0x17649 10888 bytes
font_02_sfnt_off00018e9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9C 16792 bytes