Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb421b74e8b115c…

MALICIOUS

PDF

78.6 KB Created: 2021-08-28 12:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f67f035f5fcfad96d0d32e813a1ca3b9 SHA-1: 8fbf7c52ef341ac594aa3c582a356e2b9f95ff7a SHA-256: ffb421b74e8b115ca085d2e46ec2c58ec0f37bcce9c7390678292300492ad9af
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=how+to+enlarge+pdf+to+print PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/9290501827.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d26f81c22bcba84f850d93e01ecf1052/lomikizaboxujog.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ee376bebaa88c87fc5809a641179462e/6998560057.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buluxarupanawuzefijumilox.pdfIn PDF document text
    • http://promador.pl/userfiles/file/fuvap.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/72124489338.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/99566809252.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/4734801680.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8235b9a27206f08bb59cc42c93b93a83/81584509267.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/bowufanin.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/44997695247.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079f77da4632---pufigi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609100050a650---10907623219.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/73320645403.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ona3d42n2igucobcolh6quf0cs/rafinolo.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071345e69903---20073585941.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/badirosogisezomor.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pagunaka.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/bijovuw.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/doporenagetufixejixuxef.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021072911541751.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/69440915b84b5af6e8df744c581938af/50508897407.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4cd60128e---sisunumumori.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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 10584 bytes
SHA-256: 7f4f02ccac170eed014f1c27980ff9fb23b77304415a9036d5fa2b2d1cd01d9e
font_01_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 16276 bytes
SHA-256: 8ee36a6eaf38438ed637fbfd6c5ff64cff632405d3cff0524c1eed7a35701f87
font_02_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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