Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c06d42b59bdfaf…

MALICIOUS

PDF

91.3 KB Created: 2021-08-06 16:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60b55e17d04021c25d3b2b5b36d9793a SHA-1: cb3422eb545911e5b33e7c97ffb6eda96c4dc502 SHA-256: a4c06d42b59bdfaf09439023e4ae06f127b942a1c79b92246320df53ab3e58bb
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristics indicate a link farm and a fake invoice lure, suggesting the document is designed to trick users into clicking malicious links. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inwebjor.ru/uplcv?utm_term=outstanding+payment+letter+sample PDF link annotation
    • https://clubberia.com/js/ckfinder/userfiles/files/pafiledakazaniba.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/98705236418.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/43024777561.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/16586224631.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210704083315.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6eeb6c9---limekaludipiliso.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/gf978h5t5v56flon4b9vq1ou64/73221509303.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/56d2a7549d49307989bcf7c32f50c56f/kawedap.pdfIn PDF document text
    • https://wagaskar.com/media/jinepapomidumisekotuwuru.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/99301131289.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/92695e2235b9626180cc89d222e720ee/87510230668.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789ca3bd---zororazen.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u9rcjm2i9b63snrs2a02h5mt70/88517162557.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4241cdb6ab9e99ed8e3220b129421a7c/ribotaxat.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kugelidedoperiji.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920805955dc---tenase.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607034f3d5309---zufuwetowujemu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/rc2lhh03bjmmbvaekn6gpdmmv5/31529726418.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/lixesuxek.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/99827680056.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061223030073499.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/tanad.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/s0rmh8afpflkkoihb3u0grglrq/30279823171.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e711635058---13497014536.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7e3629016---57305429820.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_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 17492 bytes
SHA-256: 4f79544075722281f451343fb0f6cdbf117e70a067704edb8cef36ecfc1125da
font_01_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 10852 bytes
SHA-256: c452b4d7e4eac8944ebfa1ff4bef0a9739198900846f16005f173722dc780cda

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