Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4fc5a20e023b61…

MALICIOUS

PDF

145.6 KB Created: 2021-06-29 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6138d939c41b40a506978fe93bbc8519 SHA-1: f89e8522d32117f0438228bc81d087d53c7d43fa SHA-256: 4e4fc5a20e023b61b623c2a436592125cdaac488d8f970c06b82fd8b388bc0a2
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links to external files, many hosted on compromised WordPress sites. The document's content and heuristics indicate a lure for recovery secrets or private keys, combined with a password-protected archive tactic, suggesting the user is tricked into providing sensitive information or downloading a password-protected payload. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://a-kamen.com/userfiles/file/59815212705.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/29819803995.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/57459012893.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/9256257265.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dq86gmctme27hqieikjeo3cqp5/dizodaxebozopafifefo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c542daf753---20252712309.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ba7e0d0f---18282768058.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6cf8bd8b---jaruwoxogukuvok.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/4nvskd75ods9al6icnomsrv3k0/15777698942.pdfIn PDF document text
    • https://suksesunited.com/contents//files/23419746055.pdfIn PDF document text
    • http://kco.su/userfiles/file/68851071240.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/gofuwefedojisurevo.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/sasuvi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c6219a7729d805c29b11f5a4883f8d9/89740806363.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/legopetedonadigenotag.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/repisumonixusuwawe.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/63d17bc704aa2f64a5fb9afda461cb2b/13404051572.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/99641595279.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/67572075290.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/39268158810.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5e18f57032a7256c7621ad877204977d/99955545885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rotate+document+in+pdfPDF 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_off0001db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F389 10612 bytes
SHA-256: 5671e3e349c10092e91d9bc3327f8ae4f649e976bf71ce5f26e1882de99ecbc3
font_02_sfnt_off00020bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BC3 17236 bytes
SHA-256: 8079f91bd00c82505eab3f99d528643ef242efee9aae37ebeabf728e895136fb

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