Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e5bb05394d86cc…

MALICIOUS

PDF

219.7 KB Created: 2021-09-13 16:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2dc333a0fac3948f8361774485f44936 SHA-1: 87e58398c40b9a5c7036b3cee99e9112d745b915 SHA-256: 51e5bb05394d86ccb6c6389cd2977b24e52cf969c8378ef2b1da896d2336fce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, several of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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.
  • 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://holdemigny.fr/ckfinder/userfiles/files/bijixetaliroginoduxuguluz.pdf In PDF document text
    • http://travelcenterpuntos.com/campannas/file/69149309422.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210901183637_alo1ag.pdfIn PDF document text
    • http://salwex.hu/file/rosiwojumowa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cf9e9d15---1233052087.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/pivogumetegesolawem.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91e22a073---41447863465.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/rebewexokomus.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210906_4A01CB32E0531C15.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/12906037353.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139467306e54---rugijekoxonak.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/33756259842.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/13795165458.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/ladij.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091309552080554.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/54432499926.pdfIn PDF document text
    • http://thevalleytrader.com/files/susokomajupetaju.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/pumixevexomovolizi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r8lu13kidbgcuovo70ed6h39ne/4583447128.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/xobar.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/85183954569.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/sonureke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=programmi+root+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_off0002fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00031266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31266 21152 bytes
SHA-256: f4ec0dde135a58267b593ffa53a6603ecfb1b5853a0538096d3cb84bf3d9c511
font_02_sfnt_off00034a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A3B 10248 bytes
SHA-256: 727bed3d82e7b771b62fe0fc446523fbab789fd8f60db0692cad85910c9140ed

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