Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64aedc60e629f2d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 20:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 454ce9a7a79a1c5c55f9f84d23ffcd20 SHA-1: a93c84c6a2e3cf2ea8aef9437063533eed0542de SHA-256: a64aedc60e629f2d4a75f7da42d87722c4c93be137fe3dfefac2948bc4b99892
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 and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://matrainagycsalados.hu/userfiles/file/mibekuferojovabape.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9a23cfaf---75409995010.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be44b827e---28509965894.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ece609af2---67528338487.pdf
    • http://allnatureint.com/userfiles/file/10405881724.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/fivuwisezafam.pdf
    • http://adveotec.com/img/file/43832179190.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/58211541078.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d954d92cdd8---15266485022.pdf
    • http://adamlegal.com/userfiles/file/lolexomolaku.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf35f16f9db---65154542463.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2f554898---84723603732.pdf
    • http://canigrup.com/userfiles/file/29581052457.pdf
    • http://volamtuyetthe.com/userfiles/file/kekebar.pdf
    • http://stinpo.com/ckfinder/userfiles/files/76294061079.pdf
    • https://lienlacanien.com/img_pages/file/8602600005.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/acgsck507a0bev2qkvv8nmtl23/lesabofozalawenu.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d407bbf1---90447375117.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af961722b---desaxejelasidar.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076e63be063e---18359100040.pdf
    • http://teranor.com/ckfinder/userfiles/files/35082975918.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2570b2659---46744839243.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160748b5e3a54e---49752710142.pdf
    • http://myphammonly.com/luutru/files/78746402887.pdf
    • https://sfeerweter.nl/userfiles/files/laziwe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=commercial+asbestos+removal
    • 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_off0000eb0a.bin
e046b7fafcdf594e4cd8e1fe21b183b29b7010ab86129efd204a137e214d1a49
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16840 bytes
font_01_sfnt_off000116e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
font_02_sfnt_off00012efb.bin
53480f1b7eebbe47428b148ddd473067741e2a1bcfac35c36bfa0e8ca5b347e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 10524 bytes