Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c79b97345d578a1…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 16:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7321c113c5775f2faa7a705d352bf5e6 SHA-1: 3ce930cb830a58465ea0513bab7c3212109e6809 SHA-256: 4c79b97345d578a10de2f07a8a332d7a119ac1a3ba885beb904593f51d151afb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://krisoc.ru/uplcv?utm_term=doctors+against+hpv+vaccine PDF link annotation
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuwiwiwixejapulawop.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/gorawumawubo.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/71411848916.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/gidogomi.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/tugadorozofaregudo.pdfIn PDF document text
    • http://riph.pl/userfiles/file/95720126151.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/13093560325.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/58272352585.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/padoko.pdfIn PDF document text
    • https://kimcert.org/E/file/13925378582.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/lusepotorimigavolifet.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/divepomipiwafijivibowusaz.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/karexaxeg.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/2215968574.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/82414608239.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1fc583cf---66886084790.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/9492421794.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zebaxolupovozawevekanop.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/64049011962.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/fisuwini.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/gupifibigoleziraxidomi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153baf61205d---68231344774.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/feriwuxo.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909035626874674.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6857ad90d39b8dd48878311b98d94809/30406615099.pdfIn PDF document text
    • https://westech.solar-napkollektor.hu/js/ckfinder/userfiles/files/76135070027.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_off0000b36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 10676 bytes
SHA-256: ef00784d1b196806e39634cb61cb3667475f467d1adaa6e5fcf8f55ecbc7944e
font_01_sfnt_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 14416 bytes
SHA-256: dc5694e3aeaa3835dc82d4f5c624541a43c8d52b1f6bc5043e25b849df19f725

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