Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cff70e035c5ce5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 01:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56299f8e3a612a1ce0213eb18f7d3830 SHA-1: 6d3a50822ffe3cc3c86c5006f576d6cb5ffacc97 SHA-256: 24cff70e035c5ce53ed7d0b41eeea6da9182d1067a2c42ccdcc8ddd81dc6809f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggests it is designed to lure users to malicious destinations. The links likely serve as a link farm to obscure the ultimate malicious destination or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=cara+convert+word+to+pdf+tanpa+aplikasi PDF link annotation
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a632750a288---gunuwap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba32189ff---gifiwisujededul.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bc0f820ec24d75cd44030edac0a181f5/dojizavepizunero.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/50314441808.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/25481270340.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nupetedemubupuf.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b899ecd36b6---wowudij.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39fbe5351---39294932445.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160919fefe5d0c---64845227879.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/sisula.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41d766d09---22687816115.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sufapexite.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/806a195509d255ff64214a3a18270ecf/xawededakoriwaz.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/betev.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8fbqk2keab5m1v98iekirikbpv/norujegonavusafuburu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/gulebotel.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/90325627125.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c6799bbf9e89cb04c5639da274d969de/64672253441.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fefuk.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795476e99f5---51037899063.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/61743267757.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/eigun81skjqm9e8pvsclvhvmo7/72680227253.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kuwovarafinexofirugeta.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gagelugawifutipe.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/82650359373.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c37053ab8a---tenegubuxogivijegujav.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_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 10888 bytes
SHA-256: a0956db827be1f6676e8e348cffe0bf2063968c5b2d5b43892615c83b65a0251
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 18288 bytes
SHA-256: 91700f7d93f7d25686ad364910d198a648681400e817885e9c190ce0845bf305