Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36bae6914e4e345…

MALICIOUS

PDF

86.1 KB Created: 2021-09-14 01:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b895f01d2c6c4916202963aa141fd81a SHA-1: 4f035e20aa7a29bb34519bdc767d84538cd0593d SHA-256: d36bae6914e4e345591ef3190b61340c2e1349b20b2a2c05400cbab8d010315b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis confirm a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://irlanc.ru/uplcv?utm_term=android+phone+tablet+mode PDF link annotation
    • http://musicpark-live.de/userfiles/file/3573975788.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/mewevedo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rimabuf.pdfIn PDF document text
    • http://expresskaliski.info/file/mepudewugiz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/82aba17d299b9ce8c0775edc308ca725/jokawobed.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zozisu.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/4063275240.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/tuboratu.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nazuxuput.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/lulopodapap.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/tobawujume.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/dokomixebatufel.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/54938508134.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210911_BE71F878E1091EC5.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cv29q1rve66covfne37k4cbpba/fojizatakibesasigob.pdfIn PDF document text
    • https://ratodua.com/contents/files/fesan.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fubodug.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/7872279542.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/99363290409.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6524796194.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0e623e7429d47cafef55f3644c0fa79/9686297888.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/82897762534.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/86849358075.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/54594530197.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/42381233034.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 18612 bytes
SHA-256: cf1772e2cb5f4afd3337618904ffb677d89acc2955dfd0be949e9d1d8a35307f
font_01_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10612 bytes
SHA-256: 84040197bc40e39d99896e68ebf3cf55dcbd3c28fdca14852d5058ee732ad9d3