Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6cdd6bb8b8ccb7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 05:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f3c7f85a0bd1b60397f7ed27b6423b7 SHA-1: 270ddf5d83e8964e8ec31644aaf3b6b7741d0b5b SHA-256: 8a6cdd6bb8b8ccb716ca5f4e2b92a88ff42a0b8c9789913804d8679b0d43e999
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a downloader or redirector. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=letter+t+tracing+worksheets+preschool PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/h8pos7bb0psdgumhuqkn1ng4q5/jidevapafexewemofuwiviko.pdfIn PDF document text
    • http://zuche0551.com/upload/file/33988418958.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bqlddg8t3vg6ahs7t5u9skvt5m/nuginipusanibire.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d84fe7206784e6ac291dd694bcdc350e/tanitarulazuluvikila.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/lewuvibividutagazikugu.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/woxadikelologi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/041a99b4085eb99c105c43c64f9dbe91/zibowixesif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/61018b051307919f93e2957015df2d69/dolitewofurikonibeg.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/zutaxo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/jalogutokakonirubiwavaxa.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e84dc17d96f63cafc43df36a33786003/63293266871.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nelevukaninugemazujuniw.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3evki93tqv6llgmp1on9sqiig8/85429118786.pdfIn PDF document text
    • http://tchid.net/userfiles/file/silufejiretuf.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/misemiku.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/41802013583.pdfIn PDF document text
    • http://mebco.ru/images/file/tagofonupawusikuvuduri.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b4134033---17208306452.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/38500373573.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099ea277aff8---puwufotimivaroki.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f7caaddeb1292b27708b42cfef89a195/12195977365.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b0d5ba56dc4739fa1ed599aa264587ad/93093319805.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c6eb6161---xewox.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5dc231854---88008428170.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5b7a0a90---34302542701.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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 17764 bytes
SHA-256: 67eda5699ed8366f5a78160c0eb09e368643c968e38a44261e2c25d9b0a50a37
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 10788 bytes
SHA-256: 9802e6a9753123b76c18fe5435713e0dc3d7283b98d4ad334e21ed406c112080

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