Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ee5ebc60977774…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 06:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c109975bada7a5dc9a3d467e80d87223 SHA-1: 0758169d16b47f7adb5afb30b2b9ad36d6891151 SHA-256: e8ee5ebc60977774551bff7ada6aeafb63aa0d254634084331400fe5733855fb
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b52991fb47---navimatonu.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c569754a5a---radupapujiparududonodewen.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/rabazufosikibubevena.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/korelupododinuv.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/lekesosadaxiwopuki.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/2230211827.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/peloroxetirowadajesuxobu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135426bba827---19054152770.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/91905682886.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614844c1cbebb---vadibanorunekulavon.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6c40d040---86338151601.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/tukelapuwanuninesav.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/98011289981.pdfIn PDF document text
    • https://micsys.in/userfiles/file/mipinafowibag.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339d16dbc44---76780006059.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/55090899238.pdfIn PDF document text
    • https://iword.de/userfiles/file/vubebixave.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/zujiwuxerexikofisa.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/309efd67bad9b4b124bcd40ddfaa1013/toxeviliju.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905102706742664.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/20264328944.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/55452043429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=proper+nouns+that+start+with+hPDF link annotation
    • 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_off0000b102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB102 15656 bytes
SHA-256: 32035b5055f41fa0d7ddfd6c94eee6529e3be4ceee81282fec834178a73aeabb
font_01_sfnt_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 10488 bytes
SHA-256: 691b53418a50da6bbbb4466b4bdab9bfb81f785274d6ac622659441b217ad5e6
font_02_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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