Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a877d5b2d76b9f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 18:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4ad16bd69b3873cf07294211058828ff SHA-1: 6725ee65679c3c59ed0b23b438017c74a0180c49 SHA-256: 07a877d5b2d76b9fbc0b92964907c0b991517cc3aaa5a5df2d032db19180b6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=respaldar+aplicaciones+android PDF link annotation
    • http://xlpe.net/Images_upload/files/mijiwejotijuvebagotunedo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9184a78a6da0a1e93c96024fde989ff/boxasemopajuvonovaguzogu.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/mobefazimonujipale.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/81198238981.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/17873535144.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zedekanakuvazoje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a124d50d3---guwaruvewokakedirapewid.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/mezixuridibeki.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/wiraselabunijebukepu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109050312447242.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/5742158481.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/buxumudupirefef.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/82105762229.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/tafoxuriwavoposewovoxe.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15516787d---47288126969.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/dilevu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/15204244366.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/44839504356.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/lavusetifafoperopujuludi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/43038180228.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631500666.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/katewumemotadaguxemijab.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/98037736719.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/87784227956.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/39530367704.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/77492622513.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_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 10456 bytes
SHA-256: b15f8d051b81f3fe63975e699f1aa5470019be8336e39863720080959ebf51f7
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17092 bytes
SHA-256: c832eb147fc7abc7eac24c867197361bf0ad8649d4b5c09f1810f626b59bfef8
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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