Malicious PDF — malware analysis report

Static analysis result for SHA-256 605859249b931277…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 07:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cd9617182872a798e212eea122a63de SHA-1: e2218bdb8e3e809d12e953fb30018315b5774a16 SHA-256: 605859249b9312778e6af187207295b15a262a4ec30e33d7bbf0fbb4b2d3ea52
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

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://himarco.ir/basefile/himarcoir/files/17176342645.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d9de1fe---83085670325.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/418327cfebbcc65a65edd49709988095/jidofotazes.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/giluxiselosijagiwutaw.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/kurefamuporezojijuxulofi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cd1ae44f---nisinajezufunovu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/73835620432.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4fb904e2---nisinurob.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/fofutuxovivojilawus.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0899df0a586f21dbdd50daec1672b2e6/wipowuja.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/64827814943.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/61914577419.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c0583a6f300f32b2b83bf494339117df/25541972014.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5cf50291418d7c987652fdfcbba05e3/sajalowibewubenafeno.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607418755acc2---76491643790.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b09d5bdfa243fca42659233f9ca6974f/86748019418.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ff2bee997cba40f5dfc2282276854c30/46763143786.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/lobimibipaludekowobuzepu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/36850243733.pdfIn PDF document text
    • http://01host.ru/userfiles/files/38123763539.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/gixanigok.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/tobur.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d5f25287c63daecee91d2aea3e148489/tuvutizinusuzotixovige.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/68487494022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rbse+class+9+science+book+pdf+downloadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/39340585199.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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 21104 bytes
SHA-256: 2e1aba52a51ba20a1d5504f82dc3b0f35a4ec8903bbec2cd754cac6fd8bfd0b2
font_01_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 10948 bytes
SHA-256: e72fe4bcb43a277cfc5ef07e536d4e49853b3c72acac2a8d02e184ca5eca475a