Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a68a2abc73d2f77…

MALICIOUS

PDF

76.5 KB Created: 2021-07-25 15:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9133d0cdcb566ea1065aae92f923a26 SHA-1: 9b16375c3ce376d66d9919876406e4f54a3740a2 SHA-256: 5a68a2abc73d2f7748dc3ae5ba8a63a70f8cabba7b884d7c09bb65f9af37a59d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 http://au-zlato.sk/upload/files/madotavojon.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/db0d8c895c052cc18eb3af9620c5bdc7/funenixodolenanupozeku.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2693194366---podufuna.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19cc113ba9---nudizujabaketosipagakigur.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/jugolora.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1lo6f734gs86q48fcqvjaaaln2/2241815219.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/vh0albqin7d1nmn00e8t4d3l73/sulasu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/lizunurujerebedozala.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/61490846038.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qlbna9e0nbdbvpn9bomd9vo0b2/75681110108.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/69430376844.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/93811852326.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/nudide.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c5m5u29csirt66jtlo9pdkq9go/20842419730.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kevipubivuxowarep.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40278131309.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/laxilasarazanarakirivaw.pdfIn PDF document text
    • http://ipublicity.cz/data/file/76697096226.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/15268979931.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d344d2f40e4---89835098687.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/funododozanilimonanax.pdfIn PDF document text
    • https://ikansambel.com/contents//files/muxebu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/dimokagubinirolananujofe.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/12462732644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lord+shiva+ringtones+in+telugu+free+downloadPDF 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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 17108 bytes
SHA-256: 2e45f64d790bbf1c7a4e2fa664b4063a9442e921f205ec791721816eae6bba11
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 10840 bytes
SHA-256: 3df5d639c9e2ad7059c1b334a2d8cd54820767557c51153e992bd2ea281d0d07

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