Malicious PDF — malware analysis report

Static analysis result for SHA-256 8200b9b273d582bb…

MALICIOUS

PDF

89.5 KB Created: 2021-09-12 07:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5075070b24cfa566c44779afe9b722f9 SHA-1: 14ee526b023371e631e9c15c0c573614f51d601b SHA-256: 8200b9b273d582bb51c0bd5907e17e8c8f3e1217ed2de04a942432238865717e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious payloads or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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 https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c67e140---bowosokojebip.pdf In PDF document text
    • http://pasted-radio.de/web/files/monimipojab.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/nuwezajerukebedoxitotita.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132909c4a9e8---wolatu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/67261331049.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8209bbe78---7609465339.pdfIn PDF document text
    • http://dentali.cz/files/files/jizix.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/81724112321.pdfIn PDF document text
    • http://kleiberit.ru/files/file/namatedufulowiwe.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/30229137220.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210911160904834708gll5k.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/51214297403.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/jodinerir.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/13925499604.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/14302948089.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab2925a43---depenivizasafuramaw.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/99847838969.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/48764116767.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/76890532034.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/votanulotiwofekejeb.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137efe9cff90---sugikovidojov.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/medajazetezulenep.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/lemojabepipawazap.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/70387987214.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/36686726559.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/powidixolixumabuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=game+keyboard+5.0+0+apkPDF 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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 10752 bytes
SHA-256: dfa0aa1e52ade4468c210dc12d18e08f8dc37575fba279537176fe98128934aa
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 18316 bytes
SHA-256: ce865a107929c6997bfba0f21f6c556355c30bef9c9b3f92eb1b5c0c3450ff9a

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