Malicious PDF — malware analysis report

Static analysis result for SHA-256 d415b1985c84dc45…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 15:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32e9e08ceb0ff83c46be19664eb0ea4a SHA-1: bf46b1c5cfc1886b8f79ee6b6bb8dd479723af02 SHA-256: d415b1985c84dc45e4e088a6a9beaf213f730eb977ab05828917967bd6f83161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised websites or disposable hosting. This indicates a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 https://discoverthesky.it/file/vazesizovimodefaluwi.pdf In PDF document text
    • http://inter-travel.hu/_user/file/5940164047.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/rotijegodigalalatu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c4ab1361b878b20bbddccc859f859ee8/bulemegiwunusezo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/37937634124.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ariv3plrrr32ihni4opb27nf02/84434753659.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/g5l28jradqqc1ahm08d7b9he76/ranogupopikel.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/010c7fe2baad4e68c655e23140fcadc6/tulaf.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210613_82944DC9205B6405.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d23c0529---gobebusikofe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2l7uunejl2cortjecchki340ip/dazalokabonaluzefaleri.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/63847797023.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/30422d8200c334479c96e978a1c9ec8d/bamatofazapifezuvetomezo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/30565590455.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nonaweginaj.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/78030434990.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5db1b28d---gukoravupesud.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/k9q5tqcv6mc923qhfsupb1jcot/vetewatibedezifubamubari.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d0ba15c3---99345488998.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/mivofamaxipunojad.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3ff97419---sufaverazufajitiboseg.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd8e8ba6d994d442a7ef258ee889af45/47101832413.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/88f3551fb37d28408cb84e8279407b20/4913163829.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d59619088393a2e6d4569b955133e57a/nekinujiguradat.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/15074522317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=happy+birthday+cousin+in+frenchPDF 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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 18916 bytes
SHA-256: 553f54f2da3a7b867f18c1a05f808b6ede23b9dcd8137be7340e242bc699cfbb
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 11016 bytes
SHA-256: c0e3f44ccda78d7946ce0b50ed244e1873d23863a91446f454fb638de220e7f9
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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