Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ba64a19f2d57d7…

MALICIOUS

PDF

80.9 KB Created: 2021-08-22 01:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 905ecd477b91b5bae139cff6e419191f SHA-1: 95475f7c410f88e5222e9f9a3d8654b4adc83db5 SHA-256: 63ba64a19f2d57d7892a47ed2e060731659c9c7d2a645299e19d8209236eb62e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tjtii283ijmcb17o9gcdr1m8tk/moxawu.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dccb73005285ab6e4d89fbd50db66d3c/89376964650.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/50801280116.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff476a350---dusel.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xemawerizasivejisiseme.pdfIn PDF document text
    • http://generaldistco.com/images/file/98526686486.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/80466c0903d43e5c9e8cb1fd80de7ac6/luvotiniwi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798b6812145---bubuwazuxi.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/2565606716.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/468ff68dd0c9e7b5eb5879a5781d9e00/xulosuworivuwobox.pdfIn PDF document text
    • https://unosms.us/userfiles/file/73303038449.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/92325700365.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3f606e556e96c19a438b999eeafea577/14692338794.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/10886207992.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fosavedogenabofeguxafuv.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33621d8f5---56830418887.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/53904633867.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7df18568b0---vejulekurikojodoperore.pdfIn PDF document text
    • http://sbkf.org/files/files/65124168183.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/zixuki.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tj5it6b6t5te6065ppo26ak8l4/vexuxinanogufudetujudijij.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/jofaguxetimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tactics+for+listening+third+edition+pdf+downloadPDF 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16836 bytes
SHA-256: b829d4e6c7af5b89226bd98d2ea7ef22efbec39df0d2cdb8c7671bdbd29eb8d8
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 10948 bytes
SHA-256: b3ef634b6071f1fba101dd8a7574cede37aaca53ad93985a72d38b6772d7638a

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