Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa63220b1543ff…

MALICIOUS

PDF

74.3 KB Created: 2021-07-21 01:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c839b67db04a1b032fec40a256ad62b6 SHA-1: 0d3329487b37747bc49824b8b6820eff37bb9fc4 SHA-256: a3aa63220b1543ff08759131dd8a7502db1ad3bfe1791a602c573ce74c409b68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c637819ab3---22669994775.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a98fa8e1921dee5e51044b3c4b51171c/fibolotikufizu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608666a4a38c4---63998194062.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/53867641141.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/35195606083.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/62f9fd47a12950d7ea8cd791f290af54/48119242166.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zikimexakowefekalunekul.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/jamamogoludilirupofosi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a85c5155bf---80012646.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/pidimopaxudusuv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mtun5cl0vhnrliu5vslis1uie2/duzevonuvegudeb.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e8349387---wimaze.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/86306693302.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/banew.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a488fcd878---40678744375.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/tosapoduzuwinezijur.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/papakuxafupeton.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e6de94078401d2eae62397275463fa0a/46114571099.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/kedamofetubusawatikelo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c80d87f62232e1948d2a93a8e795aa61/39980396199.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/53260850371.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/14vd47isv3l2m1o9fs9gmiaql4/94890426495.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/71497579420.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/32453343078.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/903d5b4391e4f0c2c51f9088e24091ac/bubof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=weather+92122+ten+dayPDF 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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 10368 bytes
SHA-256: e2a08dafb379693cb1e4d44bd614cd39266dc6f58b31bad65b8cdd852719ab3e
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 15640 bytes
SHA-256: a6b67952886db7084fe84df07449988541ee1fa6fd5228bf6c4e90afd2134427