Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f7f021ccb3491…

MALICIOUS

PDF

261.7 KB Created: 2021-06-30 05:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6a2ca48346087d02d0ac034c8c88d06 SHA-1: 95de6900afe2ae8a52d7db707743ecaf5b1683ab SHA-256: 7c4f7f021ccb34916f00da690f0f3b3bcf27739f9fec23d0f4be0377239f92e7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, and a high-severity heuristic indicates it's an SEO redirector for phishing. The document body is unreadable, but the presence of these indicators suggests an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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
  • 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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/e4iqj4nlrqcqvi3a10ck9eegcv/rabizova.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e9f45ad29c0eaca32ee4b4d82f4bf088/rabakogi.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/34070454563.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3982d412---33666388683.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b6d8c33cf05c6176f26d60b05c6f7d80/zutiloxutibudarudowov.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/wiwovimor.pdfIn PDF document text
    • https://yuss.it/file/3570185868.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc44707715---59201395610.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd48b2105---baxebofabebanerevularumel.pdfIn PDF document text
    • https://bataretak.com/img/files/file/39035661365.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c6094dc430b---5510764339.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607415349acfe---27758415979.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/bipafugusebekanimim.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/59240eea22f95995aeb5957523393df9/91442410431.pdfIn PDF document text
    • https://wita.lt/images/files/55499486292.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ti1vpt7ka6eav8c139tlgqc0t4/26718277551.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vt0ghhr5odlg4icc85cudk9kf5/44095644032.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608049f7585c0---kinosadoxazoden.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79bae0bb9---luvavaxabedusera.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaee5763f01---9174194407.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/nanurib.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/meduj.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wavufizovuvo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kak4og6njrm6dm1ft2549rm68v/64694347482.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c568936ee8c6313843c87cbbf64dd8f5/gapupewa.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607088afa06f9---vapagokamoritesivijofixoz.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab428c2ea92---5053681950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=may+you+rest+in+peace+grandpaPDF 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_off0003a562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A562 10848 bytes
SHA-256: d1543cbbcdad1be8f04e43b348623cd46541b1aa13c1c876aaf30c667b877071
font_01_sfnt_off0003be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D680 19392 bytes
SHA-256: c67a6eb473babb95d725bb86c8a0c5a9d4c6fbe965c2de47b7aaa8f81dd52143