Malicious PDF — malware analysis report

Static analysis result for SHA-256 7475ddb87d538ebd…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 04:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45999dfb1e4f925d53fc1628c847ac09 SHA-1: 499e25572cc89594bd1474972ac697e7e9f70b0f SHA-256: 7475ddb87d538ebdde1ba540fa56d2ad2b897819800497cd1780defd92a62189
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are hosted on disposable infrastructure, common in phishing campaigns. No scripts were extracted, but the presence of external links suggests the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://huntic.ru/uplcv?utm_term=acetophenone+physical+properties PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfeae70a83---52776588934.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0943555fd385cd161c12c4e54e29003f/30322616789.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a0irjbiubs6dcvatj1a8a9gg0l/77339382008.pdfIn PDF document text
    • http://coffee33.ru/archive/file/75650910116.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jqrkufea07v5nd6vqpeo82nsk6/63563602344.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/qjv089ghvdei7li0co06b1v4ni/dabemufakodelozixemapon.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/28ea2af42a3ab158d95849cccb2a1e3f/47184583584.pdfIn PDF document text
    • http://jaatkinson.com/userimages/gidoruforubibobegumabuxad.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d2866542---besomonibewumotazikudib.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/iuok7uajlp35n5k4l14gcq9f28/68117400274.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3f3446e2---veren.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160757107d224b---30273487240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14db824a61---misagudodebaxapegeler.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/fezefoj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7e462e06833bbfbcd1b4073c951e470/saxexigazigikel.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/ditinabuwurofawepugodixom.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/83087732918.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5jgi8n00s5at3toeqcr85nuab0/12842052070.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/99468317551.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/kelogifubidixoxa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ff50344d---56137015972.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/gojusofebetozefegod.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/94232402580.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/87019037106.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 18300 bytes
SHA-256: 4aa677252fc80e2c02a120e698dd8bf2dae2eeab58f43a2ad746d460271904a8
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 10568 bytes
SHA-256: 39d3815e1ca81309f15eb75c30a307dc6dfe2135016e21e86e92b1e48f47dded
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 1716 bytes
SHA-256: 6feecf935eb8e43f0d5e10c643198b1eef9901565dd8849254cf7a23b56206dd
font_03_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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