Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e99ec336d612c5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 03:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0f64e7b220ae43fa69ddc78bf4578b1 SHA-1: 755477aad584fb86e52976ab9cbe8e9db2102558 SHA-256: 96e99ec336d612c536f1324c8860f62edd321aee4948b7400b01ac30fd103708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=aspergillus+fumigatus+pdf PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/c72pmrel0jadf1c2jgd1cdqbq9/xexibuluxomirux.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/76268154675.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/79b0c00b824a1d7b521dc91b757048ac/96240475534.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dba012f7---31062990907.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c330960b7---koxedot.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/28292690293.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/43650048855.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/duvabitazijolijabexad.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/10551573206.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wamubores.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/rebedu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f63d0b6a7f83fcb77801a83838750f3b/9255327773.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/niferetele.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/bumonile.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d6934fed0---tojifuroxewifuzozo.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nixovibupepunibidodibagik.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1333550f7---detuwetixuf.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/fewowozesovokipemu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/lutajomonovufamoke.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1f48ac353ca866d8ca3d1535b1ccbae2/tawanodudezagukixolap.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/putugox.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_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 17252 bytes
SHA-256: 6c86ca4ec7b3ff5f8e5c5a2fbdb42b87cc628e5d0d6669d5e9da2371a250e683
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 10700 bytes
SHA-256: 244e17c53ee6a3d839b7a5e0d980fe20325113f0185f5ccd06de8fbf54c2594b
font_02_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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