Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e84346cc5f7396…

MALICIOUS

PDF

73.6 KB Created: 2021-06-03 03:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e29188573a40c1edded7d38f7756fa04 SHA-1: e8fc66446ef3c2f6a086e2b31f79c26d79246f39 SHA-256: 81e84346cc5f73961c7481d76724c4dc420e1e012696bb1f93d9dfbb9712edf5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm used for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links point towards a phishing campaign designed to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07875881a---41468238811.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c754bead5---mojalifukufusan.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/jesalagupesojevox.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e1ert61kuqdun34liai8dimhdb/70930956656.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b1b73971c72cdb6bcb3c03337aef77e2/14776751539.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b69e3b60b8d---58192756036.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/66019365199.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505153126148197.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363d3cc361---teridiziboligidenebogoged.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a343bb517447bb86e1f2649ae061e/damasujiraxipukuxab.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f0548cf12---80292227405.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/56616957760.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/panavufuneduxuwusumowapig.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4fe2dd6bf5d6b5f3618083f23e039312/8037269147.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/59740480798.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc50876294---xatajalak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=diccionario+biblico+strong+en+espa%25C3%25B1ol+para+descargarPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 5380 bytes
SHA-256: 2b37522ccd2a4bc36bb8a5eba8d69f8d97e407b7b3468b4ed5ff38f0454532a7
font_01_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 11088 bytes
SHA-256: 12f655ef773f1f5971894527d2082e78cd14c77f66a807a7b869e7f26dc54410
font_02_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361