Malicious PDF — malware analysis report

Static analysis result for SHA-256 9953f7608ce96010…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 10:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70ab8ff3bb3cc298679b4f16b590a024 SHA-1: 115f2b736edb705e73f20304f2bbb9b3eceffabe SHA-256: 9953f7608ce96010cd886fd9d1a5b386184e3996eb8bf28ea26dbb228671e0a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

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 https://umiyawoodworks.com/fckdb/userfiles/file/70559654511.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327295baea9---lugukofadutadumexavafale.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/39492443370.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/67614866579.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/85bf88b01d754cb86a38bebe4090ecb0/1304856248.pdfIn PDF document text
    • https://atrax.hr/files/nupozude.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/98762436.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/givevewenovowenutunaluxud.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/1782363572.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/25663137683.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/83607946651.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae6399c28---fokuvojekufikemon.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/64729398329.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/wesetejajamuvowuw.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/80856045814.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/bijunuma.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/rejadatoligekipu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/30191412492.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/kifajaxumuribe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f7f90662c2ed10d37aa2d62ca4c0559d/tuwigusuf.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/84886130365.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ee4c3cd6---99784236691.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/dixopojomiterojupiki.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/13439638251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+android+is+my+phone+runningPDF link annotation
    • 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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 17620 bytes
SHA-256: d4e4f998b7cf627531e1455912a0eaced1559990e7cd0c0c7aec357cd618ff6a
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 11000 bytes
SHA-256: 2bcc850ceb6c9a61b71b8e820cdb0e28acd2bb33db65bf76c05a4a75fa5b67bc
font_02_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1