Malicious PDF — malware analysis report

Static analysis result for SHA-256 9785611101d7ed61…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 01:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d6be473a91727c93e1b454972b3fe01 SHA-1: 6902b300805bd07ccf40d4717f806e4a6ca69bf5 SHA-256: 9785611101d7ed610953ffbe1a35b291c4bbf3db2f9292177e474c99a2943371
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious sites or host further malware, aligning with a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efca556c6f---1344501635.pdf In PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/28407618457.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808ca285---12670265607.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/lexedajokapivujasemaj.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144758c6974b---gabosewajujisuma.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/vugopuzoxikakotomomet.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/pugebowizupok.pdfIn PDF document text
    • https://people11people.com/uploads/File/2901833454.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613394ca55cb5---bazup.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5dbcb2d64065f48aa24910e7c554b2dd/godemipezub.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/42461619110.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davume.pdfIn PDF document text
    • http://dominant.name/userfiles/file/zozufofunalopoj.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/bikedujiwefevimodivapuba.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/guwinujugugoxufoj.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/82070912092.pdfIn PDF document text
    • http://arablift.net/userfiles/file/24065473409.pdfIn PDF document text
    • https://atlantidegattico.it/file/fudugazawug.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/614328611d4ed.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tabejif.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/vejeriwawebetoselupo.pdfIn PDF document text
    • https://satesayap.com/contents/files/75604986883.pdfIn PDF document text
    • http://home-plast.ru/foto/files/dawejukuwenamopatelus.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/62028586966.pdfIn PDF document text
    • https://stopserv.ru/files/file/sameribaboligabelurefad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+create+folder+in+android+10PDF 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 10552 bytes
SHA-256: fade910cc76deef876387aa8b125a62e435bde0a87152899692f131dbd64e7bf
font_02_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 20360 bytes
SHA-256: d5dffd9c3c11a03475af196e021038ad0a2b4ef86784866d5dd5c76097ee6233