Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3e4955b4d9efbc…

MALICIOUS

PDF

104.9 KB Created: 2021-09-07 03:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 151d3174b9d4fe49597a0aee372f7d9b SHA-1: 243c34270c052c6f06c230cdb1090f80ebf909b6 SHA-256: ae3e4955b4d9efbc9f668d03e305fca36552856681341f4019234fbf0eef5d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which in turn may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=the+faerie+queene+modern+english+pdf PDF link annotation
    • http://garage-ys.info/js/upload/files/98281810916.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828fd13963---vukutogodix.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/jodumotirade.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/74802f904766e1310eb67e361dfd5be2/28430606112.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/2325788352.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/xufedoj.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c569d5f391---wafepijijot.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5p8jv0e0lqoiul5j8eebooaih5/gimuzisuwodinasesodubiji.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/10092138372.pdfIn PDF document text
    • http://domplus.su/userfiles/files/88492561663.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/vanoxogubivew.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f19ae0aa775e966421775714b0729624/buzifuvav.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/rikabasutu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4434420b21---porejenogejizolovagumow.pdfIn PDF document text
    • http://calisnt.com/uploads/files/pasibusaned.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077193b00943---zefilusi.pdfIn PDF document text
    • http://wwstationery.com/files/file/19313717858.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/uo7d5t6tg0i3qe41l1pi0u419b/gifawulifuse.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/6235921967.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/35833963769.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c26209816754521f5b4e802086b9eeb5/43065869425.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/1289918277.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vemafujogesogosewujur.pdfIn PDF document text
    • 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_off000133bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 18824 bytes
SHA-256: 26f966d096020b697f276033a77654327b1af81df4903f5f2b7a75a331b7e629
font_01_sfnt_off000164a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A6 11056 bytes
SHA-256: 7196a7696ed883a688849187c1cbbdf19d94ebb50b28e5a1dac9e16c7a7a1a05
font_02_sfnt_off00017d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1