Malicious PDF — malware analysis report

Static analysis result for SHA-256 e230b464c79f405b…

MALICIOUS

PDF

105.3 KB Created: 2021-07-23 02:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b1292ef273120b58b02140bb68f45a SHA-1: 6b4a9a346898524056d4d54faced1f610e4956c9 SHA-256: e230b464c79f405b3910f550033eee918787129d63972131f8eaf2221bd86404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://neurooperations.com/ckfinder/userfiles/files/55678163902.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8skklkpv173k4o468c4hd01k0t/newevamegilujatiweditome.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c520cb95dd2---suvut.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2f4209bb---18492561391.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3e14ada8e46e778ee04f163f1502d735/wenesilek.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/somoxubifoxinirow.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/xuduxibizuragedo.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4e8aa47ebe22e2664ecd0ab9d13ac5b5/39266984095.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609acfc6bc505---12295755782.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/radebovirifer.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/silowemubaxageser.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071675433402---4194217851.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/66768561966.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/24pcgh334ojlbmqi4h5gbtfeu2/87194645235.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e614b36f3---69293642582.pdfIn PDF document text
    • https://ip-pharma.net/data/files/29294375658.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/lolusesajuxagarejo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/81092671208.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/mebudopikosekizaga.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/94931354013.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xixeberajefifizoferelutu.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/jufajirakurawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jin+from+btsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 22632 bytes
SHA-256: cb364263f3cc6b44849f65bd1e72a4bb350dbd751654774ceb260b0df48b18c2
font_01_sfnt_off000147e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF3 16296 bytes
SHA-256: 052a5ea94cffceab827814946014b96afe8b48e9519dc8061f1b61650a4d0e60
font_03_sfnt_off000175dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DD 1896 bytes
SHA-256: 4c7da73642fb8f5e94af0f16499fd4d98f7b2e2bb9dec47977a69028a9697828
font_04_sfnt_off00017ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EA5 10168 bytes
SHA-256: 9800415bb404264cbf9cbe5ba2ae65d3ad8cda724165df7794ac2da810e25fa8

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