Malicious PDF — malware analysis report

Static analysis result for SHA-256 19937adbd4547668…

MALICIOUS

PDF

88.3 KB Created: 2021-08-02 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf41255b91c7b48d630294459fd0bfac SHA-1: 46fd19d897cdb1dadbcc48f5dbe57310da625ecc SHA-256: 19937adbd45476683e704703e20f2b65cdf9b06924597733bb305191a50c4802
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1505.003 Server Software Component: Web Shell T1071.001 Web Protocols

The ML classifier and ClamAV detection strongly indicate maliciousness. The document contains instructions to disable security software and presents a password-protected archive lure, common tactics for delivering malware. It also includes numerous links to compromised WordPress sites and other domains, suggesting it may be part of a larger phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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 https://philabc.ru/uplcv?utm_term=how+to+reset+ink+pad+epson+l3110 PDF link annotation
    • https://tdfstore.it/file/kidatesopemujederanumi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67307959597.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/5724813269.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080840a9da2f---5171065674.pdfIn PDF document text
    • https://marosme.ro/hirek/file/18005826635.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/apk196apeu45h5m643jarbq66c/mubojelelepofegibiwi.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210620201945.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/jupebomowesunojefego.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/63770215914.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5a25edad40a3986fae2cc914646a21f3/54190725715.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/sivavabil.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0b6gv89fua360fdi6aohq6qcf8/wojiderez.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/33567159673.pdfIn PDF document text
    • http://healthywithhart.com/res/file/61462565424.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/28141549661.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/gomoruvasobavo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/niximiwipilati.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae38355cb16997da0337f62682bc7fa7/navum.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/susebojezupowemug.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hh27q7fjd4cphfn1tu11qajuv/xuxumezowuzefuvarolaxitu.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/93394945441.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a755a2c78---nupotur.pdfIn PDF document text
    • 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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10900 bytes
SHA-256: e9b9d45ab00f799830746be7e03432f407e98dec92ae0b2f86e9e7e6b9206266
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 18132 bytes
SHA-256: 5b1ab028fdb6a704aa659f021f8729d695fb6e3fdadf47635df37d12fd9a46c1

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