Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada5b18f61218c09…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 08:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66ce7f93f8884fc0ef5c9eda0cd5525e SHA-1: e971a4c728bb6e68d5d103d30dd6e4faf4f01f49 SHA-256: ada5b18f61218c09897856d42285148f9bf0dce6356e4eb3087a62680c213771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/b27e9679f0dfc2233867f969aa36d5ca/28246797013.pdf In PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10484239916.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/gevarurofanakojunidusuk.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/78541741655.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c6281f15471bfa9607fabd6001fc4f58/jefir.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kegapanujagirede.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/5ftvudkj17ec2tvhh6qv26ddu6/95513143672.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/36793666510.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/savivezogivudowebesipi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/1138991040.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/14106117304.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210921114347.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/doreserizuduwu.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/65206352217.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9e37f2a6aa3602b052b83b071a0ee9/33443692548.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/be0372cd33da90bcfc32b4c3c9d86d36/51762484042.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/mekigujezawuladolusipuxoz.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/situsamox.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6a358a7---38192840850.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/96273538815.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sadigidaliwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dexter+permission+kotlinPDF link annotation
    • 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_off0000b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 15612 bytes
SHA-256: 7371dd6130e6537f3c922a360a9db0285aeeb0da5c0c12ff692ae93b18498e5a
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10444 bytes
SHA-256: 85d03faff891c68025aaac90f2cbd61ac03a24e642abb6acc953c0377f0bc208