Malicious PDF — malware analysis report

Static analysis result for SHA-256 be75a04116fb80ac…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 07:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 067d9bbc229914b1c814f59a6e5499be SHA-1: e76e77de95603384485ef104e5b2fd06303d38c6 SHA-256: be75a04116fb80ac3d9b79736546b091aa4f2e1b226aa8b45d6c4ad0f42f7439
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://telegid.tv/userfiles/file/6521406759.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1c0749a6cd75b227005b977e3044e1e6/viregubugemu.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/143158773.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/zozumifap.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/witizivuvovabujipopiz.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/527778834.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109172246282639.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/99768613348.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/61521955622.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0f3ccadb2540b6fbc07fafe78911b85/67638026445.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/pumapimoraxitugen.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wotuzegosefini.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xozavolud.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wetotakejufexaxuvab.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/kejarugin.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n5uj2cvh4dr7gt7osi37ua3pg5/99565292008.pdfIn PDF document text
    • http://wohingltd.com/userfiles/libevizuzusurifutexe.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/bemaw.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/senix.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/58710966531.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/rifozarotipij.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/66740958644.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a7o5m8mmekpule2kddhd222i34/zivetotafipadaxojoze.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/debatudexezifuditijipaj.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/96503411668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+share+location+between+android+and+iphonePDF 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_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 17696 bytes
SHA-256: 2369bdaa83288aaf673a9bf7c212b60a9a0028f06b45a78a9b8e77d542748547
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 11084 bytes
SHA-256: fb568fad53acfa0b5e0050af3eebadbdd65d6140cf7bd6ebe635f541521a4f4e
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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