Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d14d92dae575175…

MALICIOUS

PDF

91.5 KB Created: 2021-09-21 05:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 835ad91c306f4a708c36458fe0c2e2f8 SHA-1: 35bfadfda23b7ddf032e7e9fc60b7af8044eff91 SHA-256: 5d14d92dae5751756bb5f2581a32bfa8cb9eb0b84939b16ad356a30cba39fb28
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may instruct users to open a password-protected archive, a common tactic to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 https://synerhu.ru/uplcv?utm_term=descargar+pokerstar+dinero+real+para+android PDF link annotation
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/39234960026.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9709e624a9d9acbbdcfa8bad82a4e026/vosaxozozufujosoxuv.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/16770436055.pdfIn PDF document text
    • https://airxps.com/userfiles/files/nalise.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902164959.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491cecdea0f---82351385664.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/burigejeresutujejorom.pdfIn PDF document text
    • https://papiratisk.cz/soubory/motevixilevaba.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136117386.pdfIn PDF document text
    • http://fabtur.ru/upload/files/tuvugeze.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/53877743837.pdfIn PDF document text
    • http://rurisnet.org/images/file/vabajes.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fexovov.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/buralobigu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/64335069119.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/todax.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/801f11de71231a57527d2325537a3281/vadomeganizojekukisorem.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/89205446271.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jududex.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5be891799---bokirodonefaxapipig.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zuredegi.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/jirufivasafujujibod.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/wekaguzumogetuzaxas.pdfIn PDF document text
    • http://polkovnik.su/upload/file/pokemisusovapizovari.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a93bfb91---dirivutiwolopon.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_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 20760 bytes
SHA-256: 9fc18df04fb83e0e4b527d3ed2d0d20a143ee233de8c9904be00d0ed8658ea92
font_01_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 10780 bytes
SHA-256: 0b07544c3185910876a1220ac2cfc1cff238b79c068c879f19b12bceb2bd7b2a
font_02_sfnt_off0001466b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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