Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b3de7eacab49e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 04:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e02b159b28ab9190949ddba43b1854dc SHA-1: 5909c77a0f730a0b126814ad6a8669dd4daa124b SHA-256: 5f6b3de7eacab49e011ca036065627f7906c4315c806f1b56add4bcf2942bbec
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. Critical heuristics indicate the document is designed to solicit recovery secrets or private keys, a common tactic in credential harvesting scams. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential theft attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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.
  • 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://orvositudasbazis.eu/images/upload/file/nuroduwerurutipatunofor.pdf In PDF document text
    • http://harnettcountyhba.com/userfiles/file/45327850948.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/kasapusig.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/40531477030.pdfIn PDF document text
    • http://hanauhrova.cz/files/dotet.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tituv.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/17125153927.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e57010c8---83656346330.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/46411811016.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/vanufituralamomagomedam.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0mldpfk6c9u3u98dqhco8babkn/donobopozegosabisewero.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/96964109002.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137698518515---gasiwofutepox.pdfIn PDF document text
    • http://dhf-china.com/d/files/75355221917.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/mutipuzivivovipoj.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/xokofubowasewawe.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/70200705254.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/90660683744.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/13732645661.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sirabeveka.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311482836819.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/kudekofibogejitusum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+android+keyboard+for+privacyPDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 11032 bytes
SHA-256: 90a08726ca3062b91e6c43c9aba85c1f44c20aa4a009e70793cf59a8f554f4f2
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 18416 bytes
SHA-256: 0f939bd32c51243a5432f5b6836769ceafd8613278baa679e864f47c50336f3d

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