Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ede4f36fa5f7692…

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 18:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2141a1392c00d7e5e0d03ca0eda6c2b SHA-1: 5950dda9e52408cdccdbfb5f7fe08f8ddaa2c541 SHA-256: 4ede4f36fa5f7692c6be2a7473c8c0a0cd9e82e50c125950f27a50fd313a95fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/875b63f1db37ffebcaaa1fc2b5cc74c9/pisevo.pdf In PDF document text
    • http://td-mg.ru/uploads/files/83504568691.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613afb406a1e8.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598c78440c---fikojotewibobobenonuv.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78569111913.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/fenaxu.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zogaven.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xalanasak.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/26202142012.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/55429585675.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/82622360012.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a7e01ecaf8035e2f1bd2da87df71f0c7/riwixiparefemi.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/bazila.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/tevabelexefetepem.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/xalerinufegi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/jetamizijeweb.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/96274723003.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/sijowonomefoguvojujopana.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161397aee0d989---gowatuwaliropadevazet.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e8ce698a---14633659078.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/lufotozuxarofekimujenirok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=strobe+edge+manga+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_off0000b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 10748 bytes
SHA-256: 001374dc26c8f7c52dc940881d7e31ccda9dd6e7242ce3e1172d8c3f6e2998f8
font_01_sfnt_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 17628 bytes
SHA-256: 1f1739366fd8f74c8683d3209ab230527b814fe616a2853e3066e707549b724e

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