Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd68d48457a95ebc…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 22:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35628b50c161d0739ce6badf7fa0074 SHA-1: 7bc2bd48aea216cfef19feb76b817c3d564b16fa SHA-256: bd68d48457a95ebc536641fae39df4cb5d8a61e1687ba3873e9f99ac9a40facd
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on potentially compromised CMS uploads or disposable hosting. While no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alatheir.com/atheirwsfiles/file/73821411691.pdf
    • http://lateonsettay-sachs.org/userfiles/file/vasuselenezigosej.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb2fd3b288---sinerebijopebodefotakumo.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/arvhtdjg85khahcfgjkne7rr06/95130814782.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160720047ce2be---49209266551.pdf
    • http://clingac.com/d/files/betowovalotozunigod.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5s76rrmfeoi5carah0pomiir70/51861297560.pdf
    • http://vasvaripalmuzeum.hu/upload/file/xefopazerenil.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/dimigedanatemomiwine.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea99e05ef3---tibiresojiwas.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a3d32102---ginufodifizipexu.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2qij2g73i7864svdov56clae12/52384247488.pdf
    • http://brilspa.ro/userfiles/file///zadesawevaxevisudanuxiwig.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5bacf8622045390a70f260cd7da10ded/gopaxepoxova.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa8109c74---45566087675.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5503c1f812---62886037445.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5b7291e0cc3782db2356a4db21850517/35542145197.pdf
    • http://niezapominajkowo.eu/userfiles/file/bopapemogugusatusimuwe.pdf
    • http://metapolar.hu/tmp/zugabenukikigeretasuxazax.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea171df0b5.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4062c8f5c44c52a61cbb302019f81555/disujajuzutixoxevifezebiv.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/86c4845fbab2ea7336dfa10aa0083561/51214272459.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=1+year+old+drooling
    • 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_off0000e9e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 16792 bytes
font_01_sfnt_off000101f7.bin
ff3a586bd306bf33e4b0733d8a5f177993310f1bdb535cde6cd48aa3e034b22a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 10224 bytes
font_02_sfnt_off000118bb.bin
748d45edf42181285bfbca29d3c1d9e55e121fcaecbe11870ff63fddafcd9f56
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 16600 bytes