Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9a0b4a24d78677…

MALICIOUS

PDF

124.9 KB Created: 2021-09-07 01:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f961ecce0fa49bee5b9352932ecc24d6 SHA-1: 72274af0077d3a3cecf8a5e312b062171837a7bb SHA-256: fa9a0b4a24d786776e52d796f549441cdecee4478e087a66abce0e4e99ee3bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or attempts to trick the user. The heuristics reveal it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/nnkgfc7mibgfhsvjumiuh3jbmg/buzikelo.pdf In PDF document text
    • http://biosurfest.com/userfiles/files/rodisuzi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/wujadizulutilewig.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0b64382d---88337824164.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/26a3608cd375bc8e8fcb428a085805fc/mewijisip.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/nugagaletevilalipu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd487ceef32---jukutasekidotafoja.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/12290757279.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/15883757329.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5083390fd5---miganuratuwifugidezibut.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/88509941323.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/neriwufipebisiridoxi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/16918972396.pdfIn PDF document text
    • https://migger.dk/userimages/file/91854866138.pdfIn PDF document text
    • http://cartopack.com/Images/file/mitoverexiridu.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/41840356461.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/49621593765.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8329c009da---33615385176.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nafejelepebumu.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/59434765140.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6cbd95dc0---7583904992.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a703c1aaf30---81244482405.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/padixo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813596dd1a---tegexabilej.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s9uvs6lh4n6ovmi8ndf6qv62ng/94941158294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ferdydurke+pdf+rozdzia%C5%82+2PDF 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_off000184df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF6 10608 bytes
SHA-256: 9d082d5122f88eda40244ead2f16279d6f6c7f6c42135c33bde7ef3ca3f06de4
font_02_sfnt_off0001b569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B569 18300 bytes
SHA-256: 076751fd4b644e77a658e71c32b2a0bc1be3fe58a7140f937609e174979a0dd2

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