Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbeed9cbded824b…

MALICIOUS

PDF

78.2 KB Created: 2021-08-28 16:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6319dd57b8c9c3ff7d073100ce0a9fc9 SHA-1: b037bf98bac0377dd8ffdbeeeb71dbaea8dc8494 SHA-256: 0bbeed9cbded824ba0dea2996d6d0115c4bba8c147b7d346acc4ce4eddfddba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure suggests the document is intended to act as a link farm, likely to facilitate phishing attacks or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=nordictrack+t8+0+manual PDF link annotation
    • http://tplustech.com/images/ckeditor/files/91108201174.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/53083902216.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcd4928dd---9906414129.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f83bc9ac2be8fdc065d2f029d52706c1/xutiwuj.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/90589165889.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/bef4rnj66f2742md3hu01o8od0/16462519757.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081127919195---raluvuva.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ktt915j1p3prqdd9g59bgianel/duduraxatenuvepi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6eb1d89342d8c1afe4399d8ee535cc53/giregizukevu.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/juzavutetiv.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vjus37hle140l8ogusofcd3jq7/pesutitapumuno.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210814010913.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/14394258524.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/55021145972.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610c79cf31cb7---21722063329.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54479423153.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f3946e7d832e412edb25eddddda98b3a/xakubilitikirogawonugu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4320c7976---95720853245.pdfIn PDF document text
    • http://aimic.com/userfiles/file/sirodunitagiwivi.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/38597330677.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f8974c70---wufokefunufopo.pdfIn PDF document text
    • http://tipiland.net/upload/file/94684654352.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_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10728 bytes
SHA-256: 1313a1fa28a01762a5faf05e87b8d194f149817b7007b4a1d6cf455862bff028
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16800 bytes
SHA-256: 90e7ec9ab652c7296a893f982e56d7e45e00518e721af2f94a974b992f353820

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