Malicious PDF — malware analysis report

Static analysis result for SHA-256 d666edbbccdb8341…

MALICIOUS

PDF

126.2 KB Created: 2021-06-19 17:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: df9d2219f611914b72feadf600ccea38 SHA-1: 042f9bd8af65ef3b743058e8246eda8f7881fe74 SHA-256: d666edbbccdb83418efe04314d6b38e8500894e1b0e72694f13c2f58545c70ee
224 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document actively requests sensitive information like private keys or passwords, a common tactic in phishing and credential theft campaigns. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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 http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a06eb8660---34038712507.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jufejavebi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/28ed429eb782b39cb2b70ac6ce71696e/14938766543.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/97372450241.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/29dcdca59bdb313609bef8a3525697f5/79490941109.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3onj0uhuomh2sk1d8rurf76600/51243507790.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880712b5c3---47847347212.pdfIn PDF document text
    • https://kopari.hu/files/file/kolowewufolabipiguvulu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767919855b9---bomigofukonobikebowum.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/xitojabufen.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d94ee3a9eb---7843640895.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609aec99766a8---5017775475.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/25487439599.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b796098b05e---17720295589.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/74631994905.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162396026917.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077941ae522e---50613431706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=service+tool+v3400+canon+ip2770+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://scripts.sil.org/OFLIn 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_off000197a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197A4 5832 bytes
SHA-256: 8af1e1c761c8292764ae699b3bf6c295d2e4bddaf502d50ba6fd2a290c5d8ad3
font_01_sfnt_off0001abb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB7 12376 bytes
SHA-256: 0416b360264a80deef65368d6fb170900bb1cc8161c98e984762827c434c34a3
font_02_sfnt_off0001d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5FD 16176 bytes
SHA-256: 19db5ff4ee5e380fd49a41c728ad342fd8f0318800ee2b58c38041898890a7ff

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