Malicious PDF — malware analysis report

Static analysis result for SHA-256 d973bc52ba85ce60…

MALICIOUS

PDF

93.5 KB Created: 2021-09-15 17:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c86ab18e4c410a97a2345d9da9dfa873 SHA-1: f511161b1c44efcce27d306db5bdc48d0931b157 SHA-256: d973bc52ba85ce605b456a767a593436f4e156e3ecd175e4ef82f10a6552f3cb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to various URLs hosted on potentially compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of embedded JavaScript indicates an intent to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ce82e5ac03c9cc633f701ac1fbf78436/17352401722.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/napaw.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/70165019803.pdfIn PDF document text
    • http://rc-modeller.se/images/file///towejafovuraxadigan.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7df8cd83047176d2d79e7fffcced106e/larotilolizoziluvarom.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/40243374708.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3ddf7c59062e55e4416478f2c0532cb3/kobonugojul.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kijufumofasupawukidarike.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/44469494768.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r0qnu1b022j38k59940s223erl/zasagakiv.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/gusinaragasulo.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/32154776120.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/16365625171.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/4277694854.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zenevowavetovizakek.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/ruvukoko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6d89b222---dorosexulogurujer.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/faninosefezi.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/19556343431.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kexavuwofakaxegubiniju.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d67a7892---fiketotamuguwusakos.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/mifezojusimomilebama.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rigegoxitixase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=graphic+equalizer+androidPDF 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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 10688 bytes
SHA-256: 20dc7878bf8568cd5847ccf8c2d12207622dd1a6cc1b7aab1e907670b58e7fc9
font_01_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 18436 bytes
SHA-256: 6c990b548f0f7f97219c3500bb4c5f111dfe2ba936a540167ee2bd3f72474dab
font_02_sfnt_off00015031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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