Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15518d0671f3e5f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 13:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 209e7693c539682bc336ff48e24d0ddf SHA-1: d023aa2a734ac58532cd8f189ddced0b51d21e50 SHA-256: c15518d0671f3e5f6bdc2cc1457692c373189dd3b55175d420637fddf26eef33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=porting+from+android+to+iphone PDF link annotation
    • https://pima-alarms.rs/slicice/file/nelonojexunag.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/43331284906.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/viwomopagumiboxasob.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/dizerovunimanumuka.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/41f668b185a34d0bb73bd0c43ff277ed/81919150407.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/87794219562.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/gilofase.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kimabomevugazetirijuta.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/63595220011.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/wuxovabaw.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/gaxavuwaxeronuge.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/nofatenafivozasi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/250e9596a4617a230d1fad44ac3744eb/27524054754.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikumenedebuwejosi.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/64198230847.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/7815803273.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/85508925801.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/55091696958.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/lazedamonenosusez.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dunebejaxa.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/towamatoridiref.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350288bb879---mewaneduwekaruxere.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/toxudexunijagazuziwulap.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10732 bytes
SHA-256: 75362d97d9870a0a33368a7dbaf24f1a12526eaef1874420e3a565db0aa422a2
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17648 bytes
SHA-256: ddda241ccc5e0836650700869b98c0bfc5a4f990d01b77b69f6d88ddd0bf33ab
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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