Malicious PDF — malware analysis report

Static analysis result for SHA-256 749962d6c33b3bef…

MALICIOUS

PDF

85.5 KB Created: 2021-08-26 14:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93a80c805b0b770a7dda1f5e3fc62ad9 SHA-1: d3a33de0f9d3ee0ee040d473fb51bfd60ad3fda7 SHA-256: 749962d6c33b3bef624baf17dffd127d3971935ddc20908915c65827cdf55fb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07ad14ad7---84929379317.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l6bb3jfgaf9qobu7j5iae70cjg/zowex.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/9416582920.pdfIn PDF document text
    • http://chongros.com/userData/board/file/40719801958.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/lavubofonekugem.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gotadukasekororezupaji.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a309563fb---pedinetiwuzu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuzexazowenevab.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/bojufafuzifal.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/sotaraduvobivel.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/bokijulakil.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/kobevebovetedan.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/8843641789.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/61704435872.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/24055310191.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075d99f9194d---1261292817.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/lixakumovesixazi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce40a144890---kevegirar.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ddc3734e---nusaloxivoxeruxer.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a1925a79eaa5b6f83c5e6343d970bed2/61548753028.pdfIn PDF document text
    • https://jin-ji.com/upload/files/tatonujalolo.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/15067112886.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vukaketepumupipuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jeopardy+game+powerpointPDF 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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 16396 bytes
SHA-256: cb3793dc02b09f334702106c3ee3ded9fb316bc2861c6fbb11e867584351904b
font_01_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10712 bytes
SHA-256: d6b865dde8fcd09ddf92dc096afbb948f503e6f44ebe700bd4c9ae10e6cece66