Malicious PDF — malware analysis report

Static analysis result for SHA-256 371cb58d15ebd5fe…

MALICIOUS

PDF

94.1 KB Created: 2021-07-15 19:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2af017266d24b0095ddfb9db47087faa SHA-1: 0d54f56001c1363b76dd4e6483d68ed07f47652a SHA-256: 371cb58d15ebd5fe730874bbd2abf32835a438178e6b4305e0f1dd189b85ba66
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a phishing lure, specifically requesting recovery secrets or private keys. It also includes numerous links to potentially compromised websites, suggesting a phishing campaign. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicate malicious intent for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • 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://lamachine.nl/userfiles/file/38743685131.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/64c4466bafd05a1e8a6c7e15391f4b5e/muwudiwezevitiz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038f9167d4---zegixovofala.pdfIn PDF document text
    • http://premium-h.info/files/files/pavipune.pdfIn PDF document text
    • http://brlairport.com/images/file/piranesofaxawenol.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/07c2e6e7ec4b1585e649d5367c1b51db/bagip.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/difirisasenebukewalulow.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3599c14---88736366929.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/55i0ofdtand9l6eg8nnsob80u1/98126489052.pdfIn PDF document text
    • http://inncredel.com/uploads/91253809666.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/60202829751.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/45906827477.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/82462075581.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/85322517943.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e4ff8a4b55117353846baa957f98e359/rapageraguz.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/moduvugesiju.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/14383110371.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abfefee402d---vojijapidisukimepuvovej.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/82490786011.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/67319807826.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2c6b3556---rutijaravuwa.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gc7l4hble4f5fn90mer1255a8o/94449895571.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/86872156658.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14498a5b3c---89969358712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cybersecurity+essentials+1.1+chapter+4PDF 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_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 10932 bytes
SHA-256: 3b0026740e49a2793a0e70459c119a9e15f3a53d9fb7603a2793cc4dba03a15b
font_01_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 17756 bytes
SHA-256: ca912adb9419fc2867b757602c863c5982c001ed7b3cd59503ac28db8e329259
font_02_sfnt_off0001533c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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