Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedc6393351f28ee…

MALICIOUS

PDF

98.4 KB Created: 2021-09-08 03:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8a9f6094a6dc5a4df706414148f6ddd SHA-1: 38517c5b2ac506aeba47bc81282409388cd3bc21 SHA-256: cedc6393351f28eedf502a2918be92e3eb197575cc9e71efe9a00ac4970ce921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous links to compromised websites, including those hosted on disposable domains and WordPress upload storage, strongly suggests a malicious intent. The ClamAV detection and ML classifier further corroborate this, indicating the PDF is likely a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=verizon+orbic+journey+v+manual PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e3191487---raponixiwefuti.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/11084083655.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/60847044145.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/zodawasawizeden.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/maforogipulujagavusawi.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/gijinulunepebok.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/10514857432.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/57169304570.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lixakisegexulegivaka.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/vitojufibit.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/43550573396.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/wokoluware.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/51933015470.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/bibidelodesezites.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/wenosulokeri.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/31872752805.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/gamogalexagifa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a73fce95803ce94e5e13abb583823fc6/91845896767.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/rudumuzubetijiviluvajo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cfc744411---12664405422.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nirejepikedopunak.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c2a1a239---96147198146.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9da853891---33698226952.pdfIn 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_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 19648 bytes
SHA-256: f4429131569a4ee9ef896f4121ed2e1302fa1a8892353f3afd6f7d5a986d1a8d
font_01_sfnt_off00015230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A47 10704 bytes
SHA-256: 119a4c8c40e15fe7e9b54d79b2853050327a7c0eac5866234c78eccb4b59de60