Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06e647aa976d566…

MALICIOUS

PDF

78.8 KB Created: 2021-07-28 06:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54f2cd61baa66f9b3bc12de686b45991 SHA-1: 8aad747d3fada09dcb454aba2092c958ba8e27fb SHA-256: f06e647aa976d566ab4cef6e16f447da9cbe0ea6c912e77ae1f933c407b8505e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19156ab4---56876833015.pdf In PDF document text
    • http://shepardfarm.com/clients/877021/File/dipigatadorimebifiguz.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/bekegujugubepomevewoxuju.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/rojavonerumevodinezarol.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/72100630998.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aae1d50eb---3365109184.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d973b378ced---63252153716.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ae148acc06d6c5c8a8aa38e98921cd9/19962575176.pdfIn PDF document text
    • http://nineslash.com/user_file/file/31727843843.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3202c3775---wibozu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc92c81d74c82679b089675c282356f2/bifukekinoraxub.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/74261715593.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//78156340079.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/73821575319.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/24172340601.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kaxodu.pdfIn PDF document text
    • https://grancom.by/upload/docs/10164214069.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fawuvapuwi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8999ae80e---16258298055.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/47840998604.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/97229717061.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00b73e9ea---farumogarupasoxazutime.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f44323feb---xijuburewixewo.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/talavumowipimale.pdfIn PDF document text
    • http://artside.org/data/temp/file/timevunevedawuninobasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=la+danza+de+la+muerte+stephen+king+pelicula+completaPDF 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_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 11168 bytes
SHA-256: 1684a04f80e9f7371956f4fa825c27f5536222bcda4d58a12ea8bf5d402d6bb8
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 17456 bytes
SHA-256: a0fab30809be1458a099d8a865eceefa2f7f1be26f6b081a1db5600d95615078
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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