Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc8caef1b65471a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 09:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13f5b6f44ad09a09479d63693cba7a09 SHA-1: 77f6e116a1cd306d601fbe1479e1b7022a91d054 SHA-256: 2bc8caef1b65471ac2f5daeac7c272bbe7d81a83bff764ea973bdb53c1f771b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack pattern.

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://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vuwopupeke.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5907d1299b---tezupu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iqn52802fgb5jmfm4hk3v7ov0r/bedigab.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0ae48a006250c6c70e7d53e0c0fa07f6/93784191075.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/66376998576.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee839929a2---jivakunedumuwusodurada.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c413c95714---rufaxekipor.pdfIn PDF document text
    • https://camphacement.vn/upload/files/fetino.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/534348387.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/lujowekasuseresenojuvaj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/f65fi9rv30aka6f0uvfk29174o/diwetudimelenejetowupipeb.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/lugopevotozedebu.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/63993021503.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/fakixubi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/jakizuduvosaw.pdfIn PDF document text
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/bedajirozikulavixireku.pdfIn PDF document text
    • http://haki.vn/uploads/files/42061696015.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jutolofu.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/7621429778.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/47534051068.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/f8o430tmimu97vd6967kk7gfhs/foronaxugijuvubodojas.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/51822846330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=character+certificate+from+college+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a48a36e0d83daef759e1fea6fa8a612b/87775445651.pdfIn PDF document text
    • 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 16976 bytes
SHA-256: 04ce5c5b210c295b2feda8d8959700aafe130e0edd6b9c311f3c3aa2f4f4f12b
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10824 bytes
SHA-256: 8528a807966ecccbc79aef2dc31a0210a8131079e37e19c0d73945fa273ab7f6
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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