Malicious PDF — malware analysis report

Static analysis result for SHA-256 617887686d95ee32…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 21:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa4c7041b94f8608d77096a45a4af811 SHA-1: 29de16f06e06a36949183e1f596087c28c56f19b SHA-256: 617887686d95ee32b774e38b5ac5614616f5f413429be35be5c774b2e66141b9
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting it's designed to lead users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link distribution, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 https://havadisname.com/upload/ckfinder/files/89256938671.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/vusajijaluf.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/95705544243.pdfIn PDF document text
    • http://888chji.com/userfiles/files/filuga.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5f45db369754baeff09407449b96040a/62667383747.pdfIn PDF document text
    • http://st03.it/userfiles/files/16706990711.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/25370208476.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/70844591367.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbf691e2f---bebobofetowate.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/84390824152.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/cl7ujetq3r7ac5vi48khlp18fc/gudazopuzetazavumaniga.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/24214837979.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/626aa97ad025238d3806443ba77d5cac/42566017865.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/48602066970.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/34936855216.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3mpaag52aoat4va8582aojm4ee/15662139417.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108260423399534.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/71783071306.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117ca0832c10---talubilix.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tegiganuxovamemadopefato.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/fiwudot.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5q8u76lkpu3e1kulc7ui8liif5/rumunozemaxiduded.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/90793955462.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fpdjtlt2p4nijhh62a5mv7n8na/40537298670.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/79739113242.pdfIn PDF document text
    • http://cocoal.com/uploads/file/bifikabowekakodowavug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=telephone+etiquette+book+pdfPDF 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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 17752 bytes
SHA-256: 09b9c492919b4d84e1a5fb23ff412225d79eff00eb0e2272e9f7c4bdfa154056
font_02_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 10604 bytes
SHA-256: 80c899202fe2a0e6ad9b79d2191d2b23e7728f4b7f3b104473b19240687fb85c