Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a4b1494e044053…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 18:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 040b4cffa6d3938865497898706b9019 SHA-1: ef47c375f97276bc7a40606a41331a66adc84254 SHA-256: c6a4b1494e044053ca9dd4e8acc53be6d476efbd7e3c1696249d0a95b2214f83
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristics identify the document as a link farm on disposable hosting. No scripts were extracted, but the presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/c43ur3e7dfpbpjhgm67q8fkfom/mekifawiledopogejuxetedi.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/mexipuvanikozeguzulu.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbed43ea3---39102829647.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cc8c213b---gomuja.pdf
    • http://st03.it/userfiles/files/bamowexisejenunuveveregi.pdf
    • http://duetsepolno.pl/userfiles/file/84037015797.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g421c7a7as1pvos78i7m6l6q79/7643561575.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd3045129---68788966372.pdf
    • http://liddellgaryfamily.com/clients/863293/File/35846161911.pdf
    • http://syarmarka.ru/userfiles/files/22565283553.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607778411dfef---vomotovekixusofuvodogosa.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f160be77061d7ada452df3eb2d9a9e/80463129277.pdf
    • http://marcelponjee.nl/ponjeefiles/file/tusozatipaluw.pdf
    • http://project-lovcen.me/userfiles/file/zutaxukipafaxesiwer.pdf
    • https://uaatc.com/userfiles/file/51027700017.pdf
    • http://patanamachine.com/imgUpload/files/38687206842.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec27250ec---bafibenogukujate.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4e7c0feabe1e8621a1921da975bde80/93324199334.pdf
    • https://essaidafm.com/uploads/FCK_files/file/20781530628.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8afc9f57---birinadotit.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609743c923773---19639516685.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frankie+and+johnny%27s
    • 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_off0000efee.bin
e63a35d0919f1dce5ece806f8c6017f10c66c90244996203f979a9b4cb2fb1b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 17256 bytes
font_01_sfnt_off00011d7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 16792 bytes
font_02_sfnt_off00013595.bin
54d6d05a8b97f10cf36849c18482e19a4405e8e1808a43fe888f13a01643d6c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13595 10548 bytes