Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d41ca9236a450b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f85f965d38eda3f6da7ce4bcd31d2dc SHA-1: 23980759beba47dde1aa7656e85ce19ffb415ced SHA-256: 15d41ca9236a450be585a49e64f21d2e14d21d58d7f1cb27ae172737792f46b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, likely to a malicious download or phishing page. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=call+flash+app+download PDF link annotation
    • http://rayocazar.com/images/elfinder-1.1/files/file/tibedobikunareduzokikawi.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/narafelisitamupezesowag.pdfIn PDF document text
    • http://hla.vn/upload/files/niwenifefuwini.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/72844059104.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/45497914545.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/44968967222.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/57545342947.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/97439010200.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25005976428.pdfIn PDF document text
    • http://agavietnam.com/img/files/41864004371.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/verinijop.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lawuvuserixotolifuduvuzin.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tidibuzivur.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zemajevo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04ad6ac03---12502847535.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/37131153976.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109091402131827.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dka91bhf19tr6lum7n45igp606/38669682477.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/zolujipexeradaguvutesav.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/vopexu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xalalulikekenawowarilefiv.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vebumoriten.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jamorubijatinebanot.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b686d68df---vobumazavenele.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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 17972 bytes
SHA-256: aaff39e89063e7c063a9cdf5f88b40010bb40f373f03e619b00d7e7ef9473b76
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10288 bytes
SHA-256: 1a40c33edeee6f71bf1581d11bfa40a0a71eb15a10466b3c2696af10a3c3fb6c
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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