Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bb74589c215f27…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 12:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2779ec2b434d71d8e2d01189d163f13 SHA-1: dfa894e6d123e26fe5f329e009e9a3c7fa24b76f SHA-256: 70bb74589c215f27c1dc11083f124951563ad93af659f6a15295348a31957e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of a Google feedproxy URL with a search term for a popular movie suggests a lure to attract users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.romanschatztruhe.de/img/files/vexipesugawivuf.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135dc89b48---35551372226.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/247d0a0a7f7be80e3374c0fb2e82dee1/vadefawada.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/nogeziwemamodixem.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/minopawotalej.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/47081004330.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/podevowojemumoxoxu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d044ea817---93423791659.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/80ee146ccd33f18211528109b9555cd1/notilapuladi.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/befug.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/jenonof.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/k9a1c46rq76ofprvigs3c23ho3/fidaxifeme.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/1998a147f2e2e97bff1c43e630db9c0b/77303671130.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947ba022f3b---93617116927.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56c411ec2---23707210342.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc05328725e---wenowamanusagugavisi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085405894698---nevepuwadixeme.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d77adba---25509076683.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/35g6rjr3ulbqsfv4fl61u46gp3/12467263.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1ba09ee9ca179ddd8390bc4c51c371d6/35616589500.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/49364337755.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d2664f21---6786104359.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e066355c1433179cff0f72334783b7c/jerofawotitozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+and+the+cursed+child+movie+free+downloadPDF 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_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 17988 bytes
SHA-256: 8ba4211e2a93541bebda30216dc366846589174ef1db1255ff670642696e2f02
font_01_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 11244 bytes
SHA-256: 55dcc0e83e50ae20945bfd4988dd22950936d2963d6ee094d3281ec861893a65