Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac49ef25b6891874…

MALICIOUS

PDF

77.0 KB Created: 2021-09-26 15:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7045588878e7a6724ebd6aacb125fa25 SHA-1: 3b2d8a82ac2706a621367de027a7024e992d4674 SHA-256: ac49ef25b6891874257d5cd7842bfbbc5bf60260de4eaa739798c7665273e131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, pointing to multiple external URLs, some hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sutipatika.hu/userfiles/files/98074614774.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/84029579549.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/zepititi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7ac9a6310---13650833436.pdfIn PDF document text
    • http://agilesolutions.in/uploads/golijuxafekakenexijedasa.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detelepez.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/dopenafeze.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kepojibuwakizi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/82518048747.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/23897139126.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/415549756312c8e2d5ca31b67ea64e2a/xitiwes.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/mifesusegojodarofalevut.pdfIn PDF document text
    • http://618tuan.com/uploadfile/file/49064650629.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/50828083100.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/viguvedu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jipuzojuxi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjl522p9l9bjge3m6qma74ukah/24551057829.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/mumezemitefapujozidigafu.pdfIn PDF document text
    • https://ags-car.com/upload/files/vuvuvuwosolabefa.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/kozelorexowigike.pdfIn PDF document text
    • http://vce34.ru/attachments/file/10298158259.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1ff1428ff1dc0c45bf7af21d114416b5/wofinaxumazutuxe.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/zoreg.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/81313362182.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141077d9bd13---28771582706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=inside+out+2+123moviesPDF 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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 10564 bytes
SHA-256: 2bf25c2e3b8da843dae0985d2baed11f6684ddefbf595bf68628e489f652e6cb
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 19704 bytes
SHA-256: 401c29c882b07b678570c4fa9daca7ea0417a3eac041ef320eb023f0bc84b071
font_02_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1