Malicious PDF — malware analysis report

Static analysis result for SHA-256 660b101ec8269768…

MALICIOUS

PDF

86.2 KB Created: 2021-07-09 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13e8fa0a3e13aac09413893acc51ca9f SHA-1: 764b28704f30e6b9c4a774c6c7bec7e018d3b660 SHA-256: 660b101ec8269768f246f40e9abe16a8a997678a6505da752e4e97983639c8ec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://chukgoobok.com/files/fckeditor/file/dipipojam.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/or5a12an9vvgu5j4hof1f3i770/tufoguxomagibigowi.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e0lta0t8163m98ak233qfdpmcl/kibosajijelulitodepugu.pdf
    • http://allasclub.com/campannas/file/57879329261.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608267de90de0---62984094529.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40ac56a5cd---27049640955.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609820ae90bd9---26093560073.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090fedc8ee31---58923534607.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/356b30a79621a2d7998394c6e0035a7c/jovururulobuvexiboxojala.pdf
    • http://murasakijr.com/uploads/files/sitovubepaxebizuxo.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adab4744dd8---fupulejisumizapopudowigup.pdf
    • http://samsung-service-center.ru/uploads/files/29260927093.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2387e63453418609981e71a93f070b48/63513706324.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/dad3b523a128c3cd5d55ea333b923a47/kasofubisasisimerav.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077bede2f7d2---kuramabobivajugerajo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c322f4aad76---wofipawafa.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dcff9b1c6---wubupaludoretuwigibiso.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/bolusefuvaxebino.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6627941a---61882243530.pdf
    • https://medtek.vn/storage/file/48243795090.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742652d8bd8---nefix.pdf
    • http://bjbtrh.com/files/pic/file/vilifejaluvo.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/88a668e8e74b0def167dc18a8ac26fb6/77461711933.pdf
    • http://beautybybelief.com/admin/images/file/2744204229.pdf
    • https://debcopharma.com/userfiles/file/62608311720.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6ca5b406---16009886104.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reporting+a+business+for+bad+practices
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed64.bin
1bda9ca4fd6ecbb5a3c4f3c052d6754341ad8401eff7b9f42ab04dadb0a9991b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 17156 bytes
font_01_sfnt_off000119d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
font_02_sfnt_off000131e7.bin
a588744e480ab8526358fb182434582d6536f8657500e81f6305dfcd048e6cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 11036 bytes

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