Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a2d6f3530396ab…

MALICIOUS

PDF

124.6 KB Created: 2021-09-07 18:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79f39041646bea11da52f750058bc893 SHA-1: e909d365c7bd81da0052ca6f4a6c61ef3da6f282 SHA-256: 17a2d6f3530396abd14ca629670f85c90eefbb10d021cd6a104bf60e91e89055
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous domains, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's designed to lure users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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 https://volnynaklad.cz/data/file/22937824844.pdf In PDF document text
    • https://kebecelectrique.com/upload/editor/file/jizazipibin.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5e831793e988414b53bab7543b772e76/kuvopigejerotisomij.pdfIn PDF document text
    • http://changecn.net/ckupload/files/liziwinebesipazodapes.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/kiponud.pdfIn PDF document text
    • https://invest.pl/userfiles/file/86271355132.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef86c7a29---52836845223.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/202de2d2739f5f0a0b372dc50abb3713/22306875133.pdfIn PDF document text
    • http://kisito.com/userfiles/file/99590242909.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/15605808041.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/37905531517.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jcobg606v5te9burv4stl7hfm3/tujuf.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/44631413970.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210728154853_dfyxc8.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861897e96e2---22568860751.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c219cc99ad4---32477313565.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e56f36f8---56359468945.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/levokuzejofusewopup.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc9e89d47---75870852612.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d137da4c---11401460682.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/40407833963.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/56912751621.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/305b176fe85c0601c7650d69cc5546fb/134853968.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/ginuzizezififutes.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/safedububulatexoluseg.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/72996884484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=academic+performance+definition+by+authors+pdfPDF 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_off000181f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F0 11176 bytes
SHA-256: 82cc675130ac0b9664ffb671e121b4872b8f151beaf6d63c05f6c079b766edc7
font_01_sfnt_off00019bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3C5 18588 bytes
SHA-256: d56a34f1d360f42293d7f014fe20f266558affda33f79c1e1d9c0cf1ecedb702

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