Malicious PDF — malware analysis report

Static analysis result for SHA-256 063bb5984f15a3a1…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 05:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c49a30c7254aada8025aac4a0138142 SHA-1: 2ba09c72723f64ca446e539887bd30612a9b1e3f SHA-256: 063bb5984f15a3a181e1bfb3293cc286de1a869b12d1909c0a7d4ac07ff64118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078881c33bb6---43841649394.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865f5970cf5---pawurasovunosuwokames.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-26/20210626025130455830.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a4342ff9---nirixupufovifunonusaxixo.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/srd0lage3ov46g5f6c2iuuc1je/pezarenogovana.pdf
    • http://www.chatanakonci.cz/userfiles/file/tafutebexiwigususun.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5613b7272---24446929475.pdf
    • http://jngf.cn/files/file/benosepusafodef.pdf
    • http://targhevaticane.it/userfiles/files/naforeberafowefu.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/52370810022.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608667472f335---mifuverido.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c9b5f6c8a7ac67dc5d147a7167cda84e/kivak.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6f8cd5be70da0437322aba709e748c1/80588274734.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/laefbr8mui76hq173g8uvta7df/40418309467.pdf
    • https://pcstaiwan.com/ckfinder/userfiles/files/84782964613.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78b9bc2ae---85330582973.pdf
    • http://czdashan.cn/uploadfile/file/2021042913380073499.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/da046c506fc83561cb8a5d84cd9b8a3b/45480680028.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/bukobewadub.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fjpam1c4uk6qq938k1gnavq6jl/16523237387.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/25055833636.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941139a08e6---30236337183.pdf
    • https://kartplast.com/resimler/files/75016592925.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8538b75a3a---49684103656.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+dehydration+cause+an+elevated+heart+rate
    • 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_off0000f757.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16792 bytes
font_01_sfnt_off00010f6e.bin
48a4c6622c28275f2855b54fd01df86de0a3fec880a32d629f95352afb637995
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 10780 bytes
font_02_sfnt_off0001283c.bin
ae86b6a666bd7be52904b173f70ca6901d3ef9f729c89287e500b33646b5f011
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16868 bytes