Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d3c278a1360d87…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 12:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6b453832d5973d66dadb43e708f5b93 SHA-1: c3b7c2a3c6bc2de07c8cc971171597e4b75e21f4 SHA-256: 27d3c278a1360d87f8e9056714187d56ca205244f61fea064d75e253d37d6a75
224 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document's content, as suggested by the 'SE_SECRET_RECOVERY_LURE' heuristic, is designed to solicit sensitive recovery information from users. Embedded JavaScript and a link farm of external URIs, some hosted on compromised CMS uploads, further support the malicious intent, likely to redirect users to phishing pages or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://forepic.com/_UploadFile/Images/file/94152125035.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a3fe6ce32305ce77bd8d91252f920513/dubarewamu.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/64029393502.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/53485758195.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/punuwe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb259ce640---mokotuzufowubig.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8323179976.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kotisajowuda.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dq54lb6sm6nbbceacp2lubrq17/wefojopopozajokowopegide.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb388705e---wovufi.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/22587548269.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/gokomukopaxufuwa.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/23217430819.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zorez.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kapifaz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ea49f6f---viniforuve.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363199811f7---toliboseniteso.pdfIn PDF document text
    • https://papiratisk.cz/soubory/1262064873.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/68546033994.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gokilevilurekefuwigu.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87820601029.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/netejofenifeb.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/jufoturipu.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/18110576134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+app+ratingPDF 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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 10204 bytes
SHA-256: 80b5d54e84fe3a9b0fb8f750a43bc1380550c473ee82187e226b28bbb1e1832f
font_01_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 17720 bytes
SHA-256: 0102611836b37eab7fa8b8300f51c58d4ca36921d0716c93eb5f8cf689b4814d
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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