Malicious PDF — malware analysis report

Static analysis result for SHA-256 9839aab259116cde…

MALICIOUS

PDF

84.3 KB Created: 2021-06-15 13:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da730a2b76da24d7b0a816d27b59ef3f SHA-1: 026aa85315927d14dbb340d34f8ba890b0d73d0d SHA-256: 9839aab259116cde380a8a579ae0688732a286fd811bf4eca87bf927c28219ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://pistant.ru/uplcv?utm_term=telugu+dj+naa+songs+download+mp3', suggest a lure to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/uplcv?utm_term=telugu+dj+naa+songs+download+mp3 PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tl1d6cdkcvut2ce8e75tj6ddr4/49569723901.pdfIn PDF document text
    • https://digireg.cz/upload/86687016476.pdfIn PDF document text
    • https://anfauglir.com/images/file/jatamisinuvutaleluji.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f2570435ae6b8ae9d4f48434d65a0302/jobigegejujulitaru.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa77051b8---renasanawobaxalurosojo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/55582584706.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/bikuz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb1892523---63839194959.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/22512110283.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086199858e7c---39451999586.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/43059367325.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/26774935b4cf75154e993a6745e6f26b/99351852474.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23dd7a7e4---39036216271.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8f8e8808298e99f84389d86e4f331fc6/zixumilagonisijilek.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/16954298266.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rq81qiqnet2d58bdt4ffu2ai6m/60909614024.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a56823b03a9---41490961570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 6384 bytes
SHA-256: acedc839b4d9e0716bdd525cb02e6b9c5dd6d9e8c8e580849d6460eb072ede0d
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5216 bytes
SHA-256: fbbf0886d1346433c433c866d30c90fc8738f63441974433292c515bd6bbb980
font_02_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10660 bytes
SHA-256: 2ba0d9e6aa7977c1f26898cb6decd74a42bb5ed98c8de0577efa3da1d92011fa
font_03_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16132 bytes
SHA-256: e888faa9002667b630927e817649ff30b430f30701d3ae5dd385702e02582ff5
font_04_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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