Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8cfc06d05c0ab5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-21 02:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca8d46b62889f2096308a0caf0b04627 SHA-1: 40c283f8f7ff7c1c4501d3ee9e99b52e12d617ca SHA-256: fa8cfc06d05c0ab546f05f77dbb942aa73ac5ae598949afbeddb73116ef3d1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious payloads or phishing content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3189a768---xixekigor.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f281005e9094e59a900951723d0d3ddb/98589593477.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/binipilumubegalaf.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d3c5bd85---73575562851.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ddc2d81458db5cfcfd70ade5cc3fdbb2/88753205693.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd4c646e6---26940429724.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cb250cf3e---2194252448.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6nv4kmi8posug6q37effktjkcs/lukuxivitagemajet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4a5d0e3afc6c5c71f0da1c6c1a6f6660/kufedujipux.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607537524f6a1---56542703803.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/sajigebape.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607923fd287fb---97358547151.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/31233469663.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/793dbe122d600f83de8bc3c9bcb2b98d/23762486429.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/unk6om3gh8tpn9l5d65l6gmq0o/59420806503.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ks4ga55ngmek6iqjk2iq82t8et/favumalazonijuwivogos.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/032510c76574b39fa3cd9e9a14af0078/95231361843.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f745de37f20---wuvuxokenisisosopozi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nimex.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/24998574010.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nikopexadiwopixofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tejas+dhoke+academyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cae4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCAE4 21412 bytes
SHA-256: bc7872685d3ae01ff0a7cf604939c87430ed885390a20bd24d689cdef5337ebc
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 17552 bytes
SHA-256: b46df8ed3a53888969ade0aaedebeaf3dfb9c167964defe183d1591408e7b936
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 10496 bytes
SHA-256: 9292d964a17abe342bab62811e117b5b3ed32727e1c6e97705d38fdf44f16d9f

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