Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad357396e6b653…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd51a1f65c53d637f3a380e104653320 SHA-1: 1b038be00588d68a9dbffc2e72c6ffcfda9ec3a5 SHA-256: 2cad357396e6b653feca7a0d5bf5bbfe511c0e08ef06db4a485a64842af8c9b6
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=baixar+gerenciador+de+arquivos+android PDF link annotation
    • http://ya-ke.cn/admin/upload/89912175772.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651de18060---16006666707.pdfIn PDF document text
    • http://atrsara.ir/resource/files/84012721208.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/njtkocq99g0dldtlse76uk5k11/36403564570.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/gufasunuvifogifopuxewakaj.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tumogufore.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/18073284043.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/81041374434.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/27ad6c525f2ace8416cd4c734fe1a120/gosemorofafiputa.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/29576195866.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jitata.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gemorez.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/dupujalubisuwibavufo.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/42980340655.pdfIn PDF document text
    • http://skolky.info/foto/images/file/jumapifarokamowujupexa.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wagajavixi.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/36301506306.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/15846092164.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/nijijepelerekowofefanaw.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/wipazatigi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25328167876.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/natepubatugujijobep.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/renozeximomofarosog.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/70325910155.pdfIn PDF document text
    • http://kbchina.de/upload/zavodevetufusuwedosa.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 18092 bytes
SHA-256: 40b636ee128e1ba4f4b1bd6633b11182e56b8816805390e781446c25a5082958
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 10868 bytes
SHA-256: b177c7c7d962fe995b9c45a19f906e4de314784589d4e716f84f3d71d0143652