Malicious PDF — malware analysis report

Static analysis result for SHA-256 46313ad99e17d42f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 06:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 621f1214bef26d7e3005aa6358670011 SHA-1: e6ea173eddbe3022110d0198e78b5b52b7fcf74e SHA-256: 46313ad99e17d42f9635b3662d8b58e46cca42a098024ce7fe583bfd990c5ca9
164 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=copd+fatigue+scale+pdf PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ckh138pro7mderkp0nm1u9vgl5/xutonazavudavukedinadoti.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/gitujitoxesulatifuwakome.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160942dd2d3b0d---69617560093.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210703_7974BA6656B500E2.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a055f24c922---gilobezoxu.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/loxokobuvumerag.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28b63bfa48371d965391d3f1b9e51443/laxemepunubadi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45d492ddd---25275322513.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/1031247396.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc40e8602e---zabefobusafuzawusena.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/60925938311.pdfIn PDF document text
    • https://susta.vn/userfiles/file/63448234386.pdfIn PDF document text
    • https://carlojans.com/cms/file/gunenaf.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c51b6636---xozelagepumipuxuriwo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd385dd169b---10230512487.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30739459948.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a3f3c0cc334f87b86458452773a82593/79557764039.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/20236457726.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/tarubotekedofezetiwuxasi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/491228d91077b32656b96c729e046fac/37775792182.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7aka9edn3uncsprpkka9scdd64/72324616876.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zozegasakadijilupetam.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5d89bf6004c4e52d175e08d92d220/jikufewizipobukatuboma.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/aago8bk4nspsddb4360qodhjsr/55113535689.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_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 18768 bytes
SHA-256: 24b175c83e4efabc7401ee0d8f55b1245ee0b6f395a6a4472f34dbd7a276840a
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10724 bytes
SHA-256: d0718a8f988bf9d4e1726c27c6a103eb243581077c5df35254efef180351ef65
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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