Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e8aa5ae082d5d9…

MALICIOUS

PDF

91.6 KB Created: 2021-07-30 00:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90e1b1d461dc64249f9aab8e2433b4c4 SHA-1: f60fc636f36b17cbb3ceee925045e96b85b6baf8 SHA-256: c6e8aa5ae082d5d9cb0b423af47ed6a8c38c7a831a480621c494f292420aeab8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple distinct hosts and the use of compromised CMS upload storage suggest an attempt to obscure the true destination or leverage trusted domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://cgpreceptor.com/ckfinder/userfiles/files/20327708799.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/22763394237.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe61da3140---7874761817.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/20157971062.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098971dd08c2---pinerigulebezagef.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57162967845.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db0b64066d4---4818810132.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd4b4c772---61657290640.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94fd8fd0c---tugimupelugub.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/55618685336.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/40723878403.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/54107224986.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/falegagu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/xenedirenive.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zator.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/12995586816.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6d3a153b---gajaboworiboxok.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0c1b98169f19244c33a9d316ab7470ab/joruxaselebufifuvojafeg.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/m2b4pklk9mpr0nkb7uvn08jbf7/26255845406.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d34f3221---58486568601.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12dbdde5da---lujaziwu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/84f5f77f2cdf6f3e4fe26ce305014fb8/sekapub.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072205571b15---67321373424.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63859b987d---rufolofuvatupizojenenot.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/442fa4d7324c6553794c7b39b8c0e1a3/17302262804.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083577f0d5b3---52671143564.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210614123422_lu7kr8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blood+pressure+monitoring+chart+printable+ukPDF 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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11344 bytes
SHA-256: e27bb0825f106c23f156b61b5c54a1c21fd10e3bbfec3e484f26887329b69ba1
font_01_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 17384 bytes
SHA-256: 0e1f45a057a71221a96d5378ed24ed31acaa43096d5e33128f72574900745c4e
font_02_sfnt_off00014831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1