Malicious PDF — malware analysis report

Static analysis result for SHA-256 626eb52484d23abf…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 06:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0f7999335ad54b338cb4da3fa908f12 SHA-1: f74aa60130fd82ba5b8fcfbb9efd173915208c7d SHA-256: 626eb52484d23abf54261897141b27ac4cd241470f3dda6ddd6175d18b507d74
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161390d404b233---78569291678.pdf In PDF document text
    • http://diegogenna.it/userfiles/files/ravoxupasuf.pdfIn PDF document text
    • http://cabini.it/userfiles/files/limeriguxinadobafex.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614006c1ea579---gagitewuritunekutinomu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/2819107259.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/jilugifupesemud.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820303bfab---vazilimuruwajezetad.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/73486682124.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313f26f4aa---98612353062.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lusitufel.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf34f68e50---28367189212.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/gemuraboxijetu.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/63493923423.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/71392705344.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/90326916779.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/15802406361.pdfIn PDF document text
    • https://12shio1.com/contents/files/99842155763.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/posakepufoxigulanutev.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/16411171201.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/nokakabuzajapodurufopapu.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/26705945228.pdfIn PDF document text
    • https://istanajp.com/contents/files/25572577516.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/dozuwiba.pdfIn PDF document text
    • http://hoachattn.com/image/files/fafiwopekokatexunirus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=happy+farmer+violin+sheet+musicPDF 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_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 17976 bytes
SHA-256: f7899bb1315db4b5fdc12994ca9f78c0a69686bcb2a4865aab535f1e48db20c4
font_01_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 11016 bytes
SHA-256: e63ae5bbe13d4c187d9b3a9f6b4a91f119f9e52d35829c2e0a333a8ad3a9f00e
font_02_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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