Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c616a7481f7cf5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 06:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 688ba2e44790b312b857f0f65e20cedb SHA-1: 6c79321db771327a5566f7a0413c5fd178a956b9 SHA-256: 94c616a7481f7cf5836e4f51c93d9798aaf95d483a6d57f3a782954b1dce5684
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to leverage disposable hosting for SEO purposes, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/caa72ae41c745c9809740be0f996486b/zezodasemobitizef.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39f7d4a433e779a56c43aa86af9decfc/40445319371.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18abcb0776---rowajalefi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jn20se2gvvkh63criilhc0v59d/tugut.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/63993241649.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf8617537---82752596922.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0df1289bacbcf6758408962713718820/19570471336.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mmb406fmgdk01820dv7bjdco46/rexoramuvinenonoweto.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/69721536166.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/572df5b72b0cdc9cc98afc0ef543f26c/53493500447.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/95941947174.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d765037ad6c9f59a5ba9b0156c76b79/91450841252.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/61911464833.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dugijiguzanasirodexid.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/7268548924.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7ccc512b---15615763449.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/38991625565.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/wururotejavovolakeso.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081320013060.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/um9s862lf67lm7nq2v6m76t3n6/nosoxutan.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wesiwe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727f540a298---tukaxorusagefunenumen.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075717a1d26d---norekojemeve.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vinimowogusid.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/49044038790.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608820b66de6d---28645380433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=add+text+to+video+imovie+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10332 bytes
SHA-256: 986ba28adc1fbb186128682311fe462a97f3d61f8f3a81e28f9b6d82cbaf47da
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 17652 bytes
SHA-256: fd961e3ecc0f7b1d3457d4b47678583b3be806387e500f42f3884380ba4a2d5b