Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7dcb010b6f84f3…

MALICIOUS

PDF

62.5 KB Created: 2021-06-06 00:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d169ba079f2ed5b696c655ae9acdd128 SHA-1: fdce98197b6aafdf0e8642d35245b62c9e8b1814 SHA-256: ba7dcb010b6f84f389c01d076f3fc125b5b12ce3a09f4b659563c2bb11f8183f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=attestation+pole+emploi+assistant+maternelle+pajemploi
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/niblprf8no4t09ksr8lnjva580/newofilekunimugobudobo.pdf
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507120821357229.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b2c590bf747569b2733667ca9e8ee8fa/mopazawezisibi.pdf
    • http://j-line.ca/fck_upload/file/35116053709.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/92a48f261ir7g61i1kfi5kn540/kevuzozulonefefesesuxago.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6a5949bb599cb1aaa9aa7ab591504ae0/65989778424.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ee8eaf5b21b5ab435e8487e8315ebc25/44018757283.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5b094d9---goturojiliwojinakifeval.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074db8843a68---rakubumika.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f65ecd5eaebf1e15f88be67755ce7856/82598735649.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d8b1593a358f46701b4e812f3d24b4f0/63409505372.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d838d7455---22078420567.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bilukomadiluzij.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4cb855a62---xupatofagi.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/kgaaq7d69jaj9a5ir44uprddv4/xafukibuputogiromimadu.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ade8edd036c61d3636b2401daff17b45/tukivozidazepoved.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ca.bin
0f16f0b8eee14c3b093daeed36eb58b87caf435ef5f70ccf7d8fe48d4011b3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 5028 bytes

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