Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e74e1b1b928181…

MALICIOUS

PDF

90.9 KB Created: 2021-09-08 07:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 299434ad610084ae41180542b002b51e SHA-1: c22548d7f40003cedcb5a119542cd68d9a1a5f71 SHA-256: 89e74e1b1b928181264f35ad381d261da6617f14c913ed61ea7c4b653669a8b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://holyfamilycyo.org/clients/37654/File/gapir.pdf In PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/rivomofogawuzalekogopetil.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/talisigejaxejo.pdfIn PDF document text
    • http://charivne.info/images/file/menakasa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/razamuwuwakozu.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/toladudodobavejumogozu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48ab783f0---nisovowo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f4d90a6f---rapabamumubozi.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wojup.pdfIn PDF document text
    • http://qdjshg.com/files/file/58860329437.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ca29e6acddc336019f37f38a16cfd4c6/49474571253.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/13574208769.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199e198b431---perapinaweban.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/velepebojuxujumotakurevu.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/kadobolusege.pdfIn PDF document text
    • http://nessium.net/userfiles/file/53838537371.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/jebovasureduxet.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0fa118d5---timoruvenemenusowos.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/70puhoitvob2jqc4t2fcbl10nf/junotafep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076463d6957a---95268506930.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/gujavigumutevepepifamofut.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/gozeloguzasux.pdfIn PDF document text
    • http://kgmda.com/upload/files/lumezedupuxumuvotijew.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a24a095df---39428339881.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/sumunawusoliwuwotojuwo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfc11d28f---silemogofilused.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=proposition+subordonn%C3%A9e+conjonctive+circonstancielle+pdfPDF 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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 21084 bytes
SHA-256: 21fd27aa807931b91f05518464ed4664a2300d00c88d4e342de8030c1c4c4a83
font_01_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E8 11204 bytes
SHA-256: 86735d7b3e8f200f751a02da8fb06ed47bb34cf7ffdbe5f8d13d1be8b9b8a51d

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