Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a21e7fe1e8bf8fa…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 08:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9820f91a70f6856a36df3d936a70f81f SHA-1: 908756872cb46f8997fd708c42de6a2d08e6119a SHA-256: 0a21e7fe1e8bf8fa771d2697b68ffe9ec27169e6cb5965759d20c76b37fa8ecf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ristovski.mk/public_html/upload/userfiles/file/ranuroroligopumililubo.pdf In PDF document text
    • http://elsped.hu/files/file/6990934373.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/44946216715.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8123c7f7---xewetawigefo.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/6010630135.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/41687446425.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/lizujap.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/befawejideludonije.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/43071302435.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/wafapulixazowuvexozuwula.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/tedisegokipu.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/komosuruloja.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/sivewivinam.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/fibenazibejurofisova.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2a3b2f76978020375443f71b71b92069/faxugaponedusaxomiz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/xazugidugixixamizepo.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xobevaxareganewugoduxemeg.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/78050699229.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/ripox.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tixufofewojidetomid.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/tesaguzupirosikobakukexi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8228e9e984f1887088acdd00cba8ea1f/50458112021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=application+pour+lire+usb+sur+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vuporeke.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 19864 bytes
SHA-256: b4396be3dc235138c6569b9602e4751d1745be86075c7e770a9b1c2837f2641a
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10728 bytes
SHA-256: 1babdfa9cf6cbb0fd5108df4cfbeb8a491e8ea6e27baba6628bc2e50c8e6807f

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