Malicious PDF — malware analysis report

Static analysis result for SHA-256 f894f6b0d75ccba0…

MALICIOUS

PDF

132.7 KB Created: 2021-09-09 01:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe7aae625122d377df13f8faeef0a01e SHA-1: ec7c8f689113a41328cc3e03171c4292f6e5db07 SHA-256: f894f6b0d75ccba00c3e9a1df094929806aa9588d54c82e53b2bcc3e7d47867c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites or disposable domains. The presence of external URI findings and the link farm structure suggest an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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://queure.ru/uplcv?utm_term=star+blast+io PDF link annotation
    • http://malabarisproducoes.com/arquivos/files/27779891712.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/lagudijujukusiwu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/91b44c0d9c384b514046c03d4583ec7c/98935933003.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nalitobog.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/77024065150.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/20915484232.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/45246097240.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/damelajogajurudere.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/sejapimivutajobalajoj.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/92098745097.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/barinibapozafamenezosimi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131879449cd4---zimazobetagoxi.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210904020008.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/titokinebiren.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/60534250376.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613781f5011ce---82954476032.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/luxuserojebulosuliwubu.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/49395753547.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/kekuwowerugogepevixo.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/xaruzoduwipopolimekiju.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1151644fcd8408b123055bbf79bd8af4/69955111976.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lcp1f4pf37vkt4vj6r7ptq6bsb/kuxobepegasupanapiwilo.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/muzikolagi.pdfIn PDF document text
    • http://yuanfuconstruction.com/ckfinder/upload/files/7046810663.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/83062044108.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/81125530104.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_off0001a4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AC 10080 bytes
SHA-256: 88b419c9e50bcf52b4d8a88d35ed4ebcd3645b6f956e9ca93a27059a0d0151a7
font_01_sfnt_off0001bb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB31 19000 bytes
SHA-256: 9e2021cf649bc247d9ad8ea070eb0523b00a1595df23c58271897b71e69e3889
font_02_sfnt_off0001ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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