Malicious PDF — malware analysis report

Static analysis result for SHA-256 6816e61bc9f5ab58…

MALICIOUS

PDF

70.8 KB Created: 2021-05-19 15:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac092eda36dbb4c0ac10fa23fc22cb0f SHA-1: 01ba723dab3811bdc5c1f1b7ce8898c51b82914c SHA-256: 6816e61bc9f5ab58d48690d6c15fe364bb912b5580af2197cdc9e9d069a50f0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1734ca9c8ec22b59110b81078ee4bffd/kipanumumuza.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b1b7e57a4ffc3133e16173f779eb38af/76570891540.pdf
    • http://abpaluso.com/upload/file/35121315304.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/wewezuxezuf.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075839134607---544024112.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097513dd3b5a---zikuvovusapowizejaralip.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b38d63bd---49809346154.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5c0fbbb3c40a5ad0c01ec74badf2d010/30847081298.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d3a1380e---59710195368.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/20eb4e2be78934e7293cff755eea7cc3/66711756966.pdf
    • http://alnadaoil.com/userfiles/file/59061508681.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c3ee1d52---86950712943.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cc48006c3b8b0ff041e6859e03f51b1c/75152958476.pdf
    • https://adsbudget.net/userfiles/file/55627964628.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4cd43e24d520aac1b25db9355429e25e/zebizex.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16088382acbca6---14908164783.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40422cf31---42097646134.pdf
    • http://botosani.ro/img/uploads/file/69706736091.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anime+battle+3.8+unblocked+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97c.bin
85c592c0c6f3196ae29a74158178e0f0dd016aeb489072024ac6c60e187000a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 5748 bytes
font_01_sfnt_off0000ecfb.bin
0226697d3b77228f204d78cfa103b7d3fde2b07e5b8fe95a6511735f90607cac
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10812 bytes