Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29c6b5fe64c0457…

MALICIOUS

PDF

93.8 KB Created: 2021-07-15 13:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a42d6a98ccb530aeb3a2cf09cf34f16 SHA-1: 0282e52573d54704a870988a859377748a2febc8 SHA-256: d29c6b5fe64c04573e1919eff3c738f6ad4fe024ddabe8fb5d1b93bd42cc84e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a link farm within a PDF to direct users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://brilsports.ro/userfiles/file///60394001662.pdf
    • http://jandebruijn.com/uploadimages/files/waditebuketuvalulitu.pdf
    • http://vasvaripalmuzeum.hu/upload/file/dopagoto.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/84487930594.pdf
    • http://ylplj.com/ckfinder/userfiles/files/30099479771.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ff5408b47c4c84f68ab49abdadb4ef27/pupowepusuk.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/imv4n1pk40h5d92f7u4g1uve53/85814256304.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4ea5afba---70552122448.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/dtb3c59inn5hdiisp2gv0c4ru6/487360389.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df5713c83---kiweronizegolamu.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24865fd9c---6102520728.pdf
    • http://ulrike-mayer.de/userfiles/files/55628623845.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076bac11524c---3405064400.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c4af8a04b0e3329fd5eead0b484cf747/luvukobiwizu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ccb00c626d169c08ead0e8b9d4d194b2/29096185144.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6771c3523208dab5b153eabcd20b51b2/lewededewuzipivamu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ndq44ch7d79i0jb5qtmj3vsu0/xirivuterelixo.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513110545284219.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31311eca42---dotafumilufevigosekuwik.pdf
    • https://betentour.com/sites/default/files/file/76773898885.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fph5jcsds1s4n1tmnui4o7cps7/sexujagikegevixamuz.pdf
    • https://taipeitccia.org/CKEdit/upload/files/ropidibesekuwusorid.pdf
    • https://llsindia.in/FCKeditor/file/94950191988.pdf
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/5973181721.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=power+thought+meditation+club
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
font_01_sfnt_off00012241.bin
cc04f5a96e7be9f155ef502b20b5e9c04d5f4b588aa70fbba9f29e945db47d33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 17564 bytes
font_02_sfnt_off000150a1.bin
db84b855dc3089c5c096c6673f061e178cf5478b3067c11f9fd5ade281a17511
pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 10976 bytes