Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d48b63d61b2d9ca…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 07:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b56a3ce0c0595e0f03aa76a0bb8b2c1 SHA-1: 0565b1d57c2c20a095ace6ef1c936519d65fe737 SHA-256: 1d48b63d61b2d9caefd9d65cf66d17dcd5fe498ed106a2167f89afcd94297e07
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, often used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=offline+games+like+pubg+for+android+download+under+50mb PDF link annotation
    • http://sxsasa.org/images_fck/file/1630542123.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/duruwifudoxipuwusip.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xipanidipila.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/99018612169.pdfIn PDF document text
    • http://insei.eu/userfiles/files/64476909390.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6135f844b6f94.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/wepixa.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/69578682081.pdfIn PDF document text
    • https://securitydm.com/slicice/file/20325478900.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/84185943129.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/76747603467.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b5e52052f8e18871b6655b965ddd7d42/35952624126.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/dupak.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumidorewokiwag.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/muligo.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loxidugeravepo.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210909_065445.pdfIn PDF document text
    • http://guitarenko.fr/img/files/zabuwenukapabiwovuso.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df204ecc1a---73015528111.pdfIn PDF document text
    • http://regmac.net/userfiles/files/7617803211.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/37390678900.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90fc2e4e---xebipunafilenoxowad.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/pinalejaxewuweraviboku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 15464 bytes
SHA-256: 5b8a09f3a68741a3c0a6e1a1ae0a1f5f6d893f9a89c1630ae734d9c3ebee33c4
font_02_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 11444 bytes
SHA-256: 45e1af33c7a8c4a397b3a209a8e33aa396311daefbf3c182f65aab85423a22e3

Open this report in the interactive analyzer, or submit your own file for analysis.