Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b332ddb394dd277…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 12:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d52ed679cefcdf4475036160d8178af6 SHA-1: 5e048c5a1cfe96e2e6632d06561a7e9f2d9bacfd SHA-256: 4b332ddb394dd2774cc613fda3c797d8074c115773130a0cc54e19c403634857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=a+monster+calls+book+pdf+download PDF link annotation
    • http://opuspointpartners.com/ckfinder/userfiles/files/noxagewunuwuxasesafad.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lotujopevobobasedubu.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/1611774088.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xokurob.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/20755747182.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/beea2bff01084bf1d82282ede0c2e657/fasifekedatejorosatodene.pdfIn PDF document text
    • http://apvn.info/userfiles/file/vemibo.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/niwepove.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/36241790008.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/rozunosawepusug.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84380028486.pdfIn PDF document text
    • http://jainfarms.com/uploads/kuxegirotev.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140636fbebf8---21371986276.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/25768498455.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49668432714.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/74613745069.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dumenonem.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nadumeguvebiwiweriw.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/57521360244.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614366fa07201---gibepegu.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/30812171097.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/bixoxilepizoku.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/858606391.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/zatakoxolesat.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/soragepamizam.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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10988 bytes
SHA-256: 74ee5364914c306e7a381feae4519c4071ddfc3bb208a7ffe7d30761846e63f5
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 17448 bytes
SHA-256: 07ea74cf1ce47af10d04eb7c364bfa552a3db6b6afe98ea238a95f03da423e93
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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