Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c382e3e6ffcb564…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 21:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d2341bb34d916920169ee64fca44b84 SHA-1: 1ace7d969a66e9bd5fee781b1f7c0ceb430760d2 SHA-256: 2c382e3e6ffcb56459a376c5ff779f48caf9962e753644f39698a43d59bba29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm designed to redirect users to potentially harmful websites. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=wheel+of+fortune+for+powerpoint PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fdbe68920---15473778538.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/46076531534.pdfIn PDF document text
    • http://soupworld.de/upload/file/tololaxanulinesoz.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4389906cc6---15034661262.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d516f2987d---dizifatiwiwesigefatasiz.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/79361241184.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6ae11142bef42500cb2801f5c1d32cce/fepepitajeke.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p7ona4eklg6r7qbsbretrceojb/lidewaxetazoxe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161118799492bb---jikegofilozuku.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kvrdcquevuch04b8ljli50jeob/61669593556.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9afe8851365ea19a0993f24437e25e67/nipinenozazatiwupoviselon.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/87931604662.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/litupij.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8cbc251a4---1584879532.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/naxejitabon.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c090c57339a---voremokudikutuvi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1e3d9f45---beworoja.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32b78e1c7---8038114840.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210613214328_1636978128.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/vemewok.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/39120198750.pdfIn PDF document text
    • http://potlista.com/file/files/kapozinojemonumuve.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/91584818371.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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 10304 bytes
SHA-256: 325c09826ab0d00daffe3db0ba64c88d08c78a8ce045bd4389b21e37a5a976fc
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 16256 bytes
SHA-256: f404bedd5579714eb4230abfdd2ced80606aabf9d3fc2df631e7aaf1081b649c
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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