Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d92b2b7b2dee5…

MALICIOUS

PDF

140.6 KB Created: 2021-07-10 10:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c876a1e859d861ca7a05b33ec80712f6 SHA-1: 4c60a6051378006b871de3331c57f03cdb66b985 SHA-256: 4b8d92b2b7b2dee50ff48c816329f100aef928dfc7b0c0ea2dec2c38cf449731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised WordPress sites that host further malicious PDF files. The presence of external URIs and link farms on potentially compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crysiq.ru/uplcv?utm_term=paradise+lost+no+fear
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608500572b6cd---kugepusulefovuni.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6b0810d0---ruwogugozavogexepu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9c818e856c506e2d9c2154f56509af95/36750594366.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/84b14b42c0f1ae0f4fb0ebc3921f95f5/58002590730.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/garusaxagu.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9b88c03d107f7dbbb9bf2507e27576ae/39223310938.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/taxovoguripuwuwolutip.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607445e95f229---45931789041.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0c8f129f---32975669432.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2fbbe20b9708e43164cddd15c96ce66c/tajixogojogavovele.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee951c57bd---rufozor.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tjneo9n9jp097sil1tritgbsk7/16921413176.pdf
    • http://rauvuonsach.com/images/uploads/files/muxudebebakedogutomev.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08bc4dc86---61637424356.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/84ece9276702aa06f7a6c4b1e24d95e7/58727148498.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/95252569379.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f2cbb8b767ecf58240991dbb92a262fa/70238923997.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qhc9g1ol19863d5hf4adr62qut/relebikulaturatok.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/7316820470.pdf
    • http://accessprecision.com/userfiles/file/fazafuvifujev.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3074c695bb---70301716895.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab1cf1089---golafosigokana.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7690eaa233abfa25e74fd80c8a9882aa/48220217008.pdf
    • 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_off0001c798.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C798 16792 bytes
font_01_sfnt_off0001dfaa.bin
14b3b4a7ecbc86060b88ba2716535b42e724dc17e18499244406b16811977ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFAA 17648 bytes
font_02_sfnt_off00020dc1.bin
333a9e3dfa444cb6ee08155dff0e21e522b23b0f3139bbaed745ded797809b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20DC1 10348 bytes

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