Malicious PDF — malware analysis report

Static analysis result for SHA-256 370ab47f1937e4c2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 23:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3fff14aa379110691f113c2535d676b SHA-1: 43fee6f34f0afea440c42cb5f5bcdd05716b365a SHA-256: 370ab47f1937e4c2456d4b428f775bd0629fc42095cd4e8b6ee07a4643d9d9c7
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or updates. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://lideparts.com/userfiles/file/1631353648.pdf In PDF document text
    • https://artistprasanna.com/userfiles/file/56400245232.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/gigebula.pdfIn PDF document text
    • https://digireg.at/upload/138805982.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/20462624531.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/88410496732.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46fe41d34---simuwoxexe.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cb7d85ade27ebf41f83da2b80e8c0b00/77320975888.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/94432771744.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/82102851298.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/toxunojiwepigewuvalaluziz.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/bosularaselodabux.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/fifaxunowiwudeti.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/tiwaxob.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vununatut.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vkamoqp7l66mdgdtttt4j4br6f/74659359604.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/luwox.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/9488013398.pdfIn PDF document text
    • http://asja.ua/userfiles/file/xepaxazakadivolalulijewa.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23222290013.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/tevodujapevirubixinura.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pijajopunolonafefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=copy+and+paste+shrug+emojiPDF 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 17260 bytes
SHA-256: 3e45eaa7e415a2fdb215a54d86d3e6cf066cbe761234fbaca00ca696cf7e4625
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 11168 bytes
SHA-256: 840e773a7c07abb13c67683d82e68ff3f7e737446a9a0e93261d6690401566f6
font_02_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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