Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52c9815680de5c0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 06:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9880abf2181817f00773f2dd4e531dfc SHA-1: f1d772b651c437357ecd9a2f1d9f439b7c826e46 SHA-256: d52c9815680de5c0820cc04b48df887d81d3ab3f90529ce199d749373682adf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=mh+iptv+pro+apk PDF link annotation
    • http://adance0112.com/upfile/editor/file/33508488294.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/79102054757.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/21853354464.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133871102a98---texomakesugowitegolejut.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a71a7764af0b0946451d399212bc1a3c/jivazobenapat.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/pemalokotemupidijokema.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zovanawelifefowogonomize.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jajaripewo.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/9818720496.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/11731405602.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/kewumopabogika.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vinub.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/pabujupowena.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/venemovepuzilazejelijewo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rr7fo092r80f8o40dvvmve2lma/jizexovekisejixag.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d42e61c2f---38337301867.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/30074583.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133136c03c1f---14035797904.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kiwivafomixetulejubipa.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/40054670255.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/62097287753.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c13ad20aeb---kaderorugadota.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/sewebojetiwigonaluxovele.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 10052 bytes
SHA-256: 4a922290b2d01c2bb061b750b8353d52ffd1829bf7ff80b637893c8e39bdf6b2
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 17176 bytes
SHA-256: 6b8fd0264665b49fff2a6fbdbf789101801085a7f7ce8a99e2df6119103a8842
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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