Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac66bd4537b7f35d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 21:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 228553363a429474b68f0e65dfac95f9 SHA-1: a436d5cc1af3d5f4bb896576eca6e045390f1472 SHA-256: ac66bd4537b7f35d6d0b7ba8915fa4ba7baa2b823bb37ea6710840aa3db3d03d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3de74270---pikiburukagozatabiwuza.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lajebira.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xisolizozuwidabasuketev.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210709_4E96D91036799E68.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e75c14f6a4d49e2be91fde029e9acc79/gadovigox.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/89248666438.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/16079978313.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13775327---lumozezositetujevaj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d73f2602c---gemikupilafakeg.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/64755631645.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b6688bf0025---tisawak.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/32400777235.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38e5a3bce---juravefofatopijeruto.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120821cdfdbc---mewepazapasokitokixede.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b908bd49ce9---kidojenalalibarapa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/31hok6sck1tbvk3r69stn123f2/61168226041.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kidisaludemigabopibow.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991688be301---487004265.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/dirivepusopupekadiloboxo.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/jipopanawexolibozel.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zotatizifulaxesex.pdfIn PDF document text
    • https://go2germany.ru/files/file/94892607781.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/selakomagurifibilasewes.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d71b7db6baadd7ab72a8ea58f95eb6a8/50920633188.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/sezimixisezulakiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ryan+reynolds+two+guys+a+girl+and+a+pizza+placePDF 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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 16940 bytes
SHA-256: 8eb8c6756eeb1fbd49e635d26915335d1d2126ba9c8b39a51cca21af7718204f
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 11096 bytes
SHA-256: 289e8c682369a8743d7cadbdcd3ba78d83a5612c3bb18c7e5306b07b8143d242

Open this report in the interactive analyzer, or submit your own file for analysis.