Malicious PDF — malware analysis report

Static analysis result for SHA-256 239326e29370f49b…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 20:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fba33cb3cb5bf16f1fc0c02b47fe5eb1 SHA-1: b2bedd5580790d4e61bfe368c79061c7595ce2d5 SHA-256: 239326e29370f49bfdfce7df524affb605372ed56fa26ba74331da72c3608541
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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 https://krisoc.ru/uplcv?utm_term=wwe+svr+11+download+for+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d7379d02---mivepuzepurupobatal.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47519b82---tedefid.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tidetir.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/wegipemugam.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/46340733275.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/tazebodizu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34af58366---wemamel.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/44884665958.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/99053607718.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/63905304062.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/93572382151.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/norufomufaro.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/20423939559.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a0d0ddf39bb8a6f87e623228a7a85648/suxoxiduworibisunanu.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/12325752176.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/31108543250.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/zoxutupetat.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fojowavefurimitem.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/wevur.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/5626725615.pdfIn PDF document text
    • http://termocity.by/pics/files/mugik.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/siwudomodigijube.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/66298421201.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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 10448 bytes
SHA-256: 3a36d0b5375fedc581b8a908926f2df6512e0ed5acd9fc0dd67769da0054a507
font_01_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 20992 bytes
SHA-256: d2dc30291fdbc445b792b0f551a4018babb247923d04ceb025d6d544de886cd1

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