Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f610a86fb5e456…

MALICIOUS

PDF

229.6 KB Created: 2021-06-23 05:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1a4c3fe3fc7101132e7517d1b3b83f76 SHA-1: 68ecd7a7b2900512408a612abd00cf442cbcace7 SHA-256: 67f610a86fb5e4565f66a6f3b90c39dbfb8f5e7d17faa388bd31bec68db8709c
134 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains multiple URLs, including one pointing to a compromised WordPress upload directory, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the ML detection strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=cambridge+ielts+9+test+2+reading+answers PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd021cbb0---89177614585.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b22115ac1e5bee77e98d09aa736b856/weratasonibomib.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-6/20210506165814931786.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uvfktbfpi5clqm3b77qu4qpioo/49172917281.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kopuvoj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aec20e81408---tipipewivavube.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c294a57a7---72995111978.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/696u16u1e9hnlis08dlr260nh3/56887771824.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87d52968f---buremujugobibizuwowufelow.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c246ebcc99f8d17b9bbea8953330c03d/43666371361.pdfIn PDF document text
    • http://poorclarescork.ie/images/3279312164.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe74cbfc7---pujikuvozaz.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/5177777273.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dc32d100877fd85244d0653d2dea11b5/68299166169.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b5cc6515bon2o2guf6s8l4bod4/66819751478.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zowefatasederesenanap.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5e3a5d007b428e992c2122180c5def79/63669248535.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3b64dc58d7b5432fd8da6f49d05888cd/45873528578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8EC 18136 bytes
SHA-256: 4ebbbb5e3809fffa1abff1256351f536639d4300d257e7775efdc7d3a06d71d9
font_01_sfnt_off0003330b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3330B 5572 bytes
SHA-256: d12cc410dd2fce03b5cbd0b9a5c6d9827d36639ca1ea0e1f3b6f780db2680dc2
font_02_sfnt_off000345e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x345E5 24036 bytes
SHA-256: 8027d41d9c0b5bad5ef8c64e718c0a8014264a84f4906c8007537405e630d92a