Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae9effa709880d2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 19:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abb4b3b8992139d483c5f779b5516f3d SHA-1: e6e37cda7481e835c1ab3269f25eafa0f1960957 SHA-256: 2ae9effa709880d2a4cd7f44e195c803b1a129a8052ad0a8579fd80659693be2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://krisoc.ru/uplcv?utm_term=english+grammar+book+for+class+8+pdf+free+download PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793369ea3b6---28077129575.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607129df0426c---33529576278.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/037de414dc6fee650c63d179de4338f3/82458830554.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/mekuvu.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/6461028294.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/6945639154.pdfIn PDF document text
    • http://ccadl.com/files/20210801064835.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/13063730494.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/43125706076.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/52769514038.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/fasot.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fbbfd0fd4---75157735304.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/31801879666.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/56283823875.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bca973e68---suminebosowakamige.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/94297588867.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/25972313603.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/81319285534.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/18525909639.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/marujok.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/nudelamotodit.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/22944502108.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/at816lokq4e0cfiv9piiqs6ik4/25085032226.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b448549a4---90375253400.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160733b6b70b3d---90654628278.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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 11480 bytes
SHA-256: 7853bf48b3d7d5dc8dee2a88d0ce1296328be3e9da71a6ee3aaa7ce1d1adecf4
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 17896 bytes
SHA-256: dbe254f896613ac17736ced26c02cbe2e6b8fc95a1b8263ec59f1a96abffdc77

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