Malicious PDF — malware analysis report

Static analysis result for SHA-256 765e691abf2a121f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 01:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e186702752d44d6d6bfeb113fa39db35 SHA-1: eb0e7d5f9505ed990f313c5410d9bc87e629383c SHA-256: 765e691abf2a121f5980be8fabbd41d1607cbea7b4bc3917b57813b84ec22335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lobexisukituwexubejuvapam.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/bumurajumevivivojeseke.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/33424507307.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5chce5g0k1qscg9bdo35d9hfok/64531675287.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/18130634922.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/10370093218.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/banokilinosakij.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/33750092507.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/85582423253.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd08d280d5---naxisuzinamabopipejotozar.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/93090040679.pdfIn PDF document text
    • https://tsolisp.com/files/file/81655185710.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/60595699631.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397ca90fd2---1223506655.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87588979077.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jovara.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141547391ff3---demiralajizowuzuba.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/65886070756.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/13974502153.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3690a89c294f82e2508143237926c054/nelis.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d80eace2---12416984126.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/42855627340.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/sepemodeletemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+improve+camera+quality+on+androidPDF 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 17812 bytes
SHA-256: 374c66bfcc17d095f821086087da1e952cd9fde6d50f6b8ec7ebc4de19e3622b
font_02_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 11012 bytes
SHA-256: 4856ab9d2c58123964aa6b7b2094cd0e5ad970098975f5c7f87703d1edab2c24

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