Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bb24951111b144…

MALICIOUS

PDF

87.6 KB Created: 2021-09-03 15:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82d58f75068a453892c1fbf87f93532e SHA-1: f6b694fe2b937b962140fd3c61eadaaaeb1added SHA-256: 36bb24951111b14470aeeb721ec65e95ea807473057f26883346166bec388f48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicates a link farm hosted on compromised upload storage, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cmf8.ir/data/file/boxonozoku.pdf In PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/31822815383.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a16365eb---gemabof.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rudagusikugovi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b181795d47---ronukafulutozalumisunu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4b553b786b374701bec4974993232d93/94692570938.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/desg7k40tn3d7k8s1v7e7n58ik/pofaveju.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wasotikibux.pdfIn PDF document text
    • https://vleek.com/uploads/files/63423895527.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/bupuratomuga.pdfIn PDF document text
    • https://dcimx.com/files/divijosifagopupubimi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/81675957203.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/95337772281.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9f0eeb51---52282236978.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nipikobawarunexurejuxiwuv.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5660c9034---jilubiwus.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/gixibesisov.pdfIn PDF document text
    • http://davcpundri.com/css/file/gerajuzogojinokiw.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf175ee15c---48570305975.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/fanijaravav.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/91177595953.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/85064753712.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/05dbb33e30dd2c2b344c3105f72de36b/81708890406.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/se0imgc0758tl6u1qho9o1j4bd/futorav.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/66277952538.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/dadubivugekemepuxijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=convert+svg+to+pdf+command+line+windowsPDF 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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 18956 bytes
SHA-256: 369d45a031684450dd10b6b973e53a7ff35c803d844d9cb6245729d3979afa99
font_01_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 11148 bytes
SHA-256: 734c6ac9c6dacff23bd3cbf0b82588c7d036e3c4f3895d20de6a93f0df3d6db1

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