Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e56fa352118d77…

MALICIOUS

PDF

96.5 KB Created: 2021-07-23 02:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 75fb87bee08289f78704d2afe6c8c191 SHA-1: 786386a5024b15cc820d6ff54fb82a6f337e3e88 SHA-256: 64e56fa352118d77ed18353247ed94d0bd518d95ed1ef6cf77fcfae0a2ef0838
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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.
  • 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://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gvct8ug0boag93dq9kf60gvd0p/74675758890.pdf In PDF document text
    • https://coastalstudio.com/images/main/file/wogofosibokivawodixirin.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba3ef0e20---bunomugom.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6dfdbbbc3d000be8a9d7f98bd34eedd6/37243524172.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/cafmolk5j6bf51abh6u2p2bp5i/79643598599.pdfIn PDF document text
    • http://budka39.ru/files/vufax.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vldc027rpq60j1fvkd3fmq6jj7/63553030759.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0ebacc7d---kodokimudafenegiwen.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60b0d73b---56936367703.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/2e081235a23260f8e4683918389519fe/jobimokawafekukakig.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51b92ef7f7---wenuwodewibarugo.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48351956901.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ba18955d193c81b8020061b7296c0d68/32842121764.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f5e50b0e072492297c2091ab70fefaf2/11255847864.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/baf9061345fdaa59ce4be2ccd8412cd3/lisakorejonurowevotaxo.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/fenuvazivakamupenosomuda.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9bfe8e956---ragabigetulakeriz.pdfIn PDF document text
    • http://klinok-saintp.ru/files/parigewomabudarapejanuma.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/87913422922.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5719b932f---fidilogiruxo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/mulejumifuwub.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d007278950---mododete.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/81857128818.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1c2iv8n8mabvp5fivsebqc5138/pexejudovijev.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced0dbbd1e---86464044979.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/27869010935.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/49889565726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cricket+player+interview+questions+and+answersPDF 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_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 18000 bytes
SHA-256: c5153dd492a39523a408109baa4657697bb7f1abd2f11a02a642e6c3c9bd7a44
font_01_sfnt_off0001424b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A62 11140 bytes
SHA-256: e6b13022dbed5aee884e5614e02f2f1bcb3d249d8a31ae8f9f5650f2cfa90bd8