Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af464c1f16c2550…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 25c479bc9eced2aee9c44b887aa44b34 SHA-1: 27f1a69f6667e2cab16f2c944d5708eace31adac SHA-256: 6af464c1f16c2550fb13b95e776120f9d683f47e56a504a3a014db5011a83c64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload storage. The primary purpose appears to be directing users to download further malicious PDF files, as indicated by the numerous unknown reputation URLs. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817d30e2f---xibewepitudalavaxosasera.pdf In PDF document text
    • https://izyskately.ru/foto/ck/files/77546237407.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zugovane.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/xekonevojakaxovo.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/detelozeno.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a53c3b6981c24f84264bd46e5e0d4960/39028176749.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7937050f---43001865168.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141138c7b38e---53349957313.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/leparoriwolo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/43438328071.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/27104425151.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/49110156527.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/9708668929.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/vujuwusujunabeteleverire.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/tizivo.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/boxixigabo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132702f4dcfd---finuvenubinewolugiwiv.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/nogodipamugad.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131258f5a538---viwoxe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455d08e00fc---99041984218.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356876985de---javudatil.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210918_E7DE2917048C3B10.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161417be5eedea---85379495665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fahrenheit+451+pdf+free+downloadPDF 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_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 10752 bytes
SHA-256: 1a0b9ead2b28d6e22e50ee999f07c03f6411374b44399a6ee33c1f7e33ca47e0
font_01_sfnt_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 16792 bytes
SHA-256: 7947f5c90df0fb336de3df2e6b9b8e3d4bc1d241f1862e90d2436e795848c16c
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1