Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae53ab56bde3fb1e…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 01:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ca17ebfb126683bf954a9cefde91f34 SHA-1: ed4ac8cb072d886c63aea897bfbc02ce7a2b4c71 SHA-256: ae53ab56bde3fb1e41ed886f27a240bb24703807bb49acf6cea2f8dec02bd9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are characteristic of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://pierrevillers.fr/mairie_files/file/burepi.pdf In PDF document text
    • https://2acontractor.it/images/file/72766447555.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/49038594605.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/romeruxopagiponul.pdfIn PDF document text
    • https://marigabung.com/contents//files/kubulikewolu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/movefofotivi.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/64389944724.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/loxuz.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/48339511174.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-24/20210824192342514631.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5632aae11541b7da70b3f28cadbf4d3/26061945896.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fccca886b59e3ceac18d32cc600b2c6e/wixafaxigume.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e01cbec30fda0582150674363723cfb2/74307747873.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zeratupezimasozo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d671cf8ca9f77755dc4ac1760b6cbc05/60824952692.pdfIn PDF document text
    • http://chromatographvials.com/d/files/30335970689.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6bd88385---13341227867.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wavijozir.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/65925645caa7e13686db23c8023c8f93/dalitamemudelelefapova.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cd7000ad2af31309f2323367efc12953/16812027899.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/294156984.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/29499169344.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/63024823291.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/resefopa.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/najepamufiter.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5939ba1daf---55930309730.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/xuxugibajoxibuzuzemogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cancer+man+in+bed+with+sagittarius+womanPDF 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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 11128 bytes
SHA-256: be147be11413e54235a0ddbd06c3d9d6a879636910a9bc569e91e4b7e0679747
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 15336 bytes
SHA-256: fe079d4ba484d05c2cf013823939bf6e724b7872f6dd56e3b2e02165998603ec
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1