Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe8c4267fdb3a2c…

MALICIOUS

PDF

74.7 KB Created: 2021-08-05 00:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac9c299b06606259a90406b3a5da4163 SHA-1: 049b673175b648e342f1bde3b56136a7044574ae SHA-256: ebe8c4267fdb3a2c06d4bce66a3059681aa25bd55136d59cac3fecee902af94b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS installations. The primary purpose seems to be directing users to these external resources, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9639dc46c---wakuxik.pdf
    • https://lawina-radom.pl/files/file/gezesuropim.pdf
    • https://basundharamart.com/userfiles/file/41592324238.pdf
    • http://eksan-ltd.com/userfiles/file/gefojanog.pdf
    • http://harissarantis.com/userfiles/files/vureginipa.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9ac3413406adf4ff713a374d3222ca00/vixavawizozumanaj.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jvdj5uiqkulu2n3u90hlepr2rq/76617030072.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83c83804d---2700422442.pdf
    • http://yishiweb.com/upfiles/files/20210710_145154.pdf
    • http://colafranceschi.it/userfiles/files/xovuvixidiregidolamegolu.pdf
    • https://aspirans.com/files/file/pagibew.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ae84da947268c4ad35079c8a9cdc03a5/jujititasor.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q3o2vspicsb0i2i3kirtnl0jgj/sulanizoxidasasifofivez.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607924a2d76e1---zufejuxugaroderemujosat.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161045bc7c4d28---23096593634.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff3b7bbffa---45027844093.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607711e8619c7---sipozobikekuruvofokunewo.pdf
    • https://cmoretv.com/userfiles/57106761751.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bd581d05---88190541876.pdf
    • http://firanywiktoria.pl/uploads/editor/file/rubizadedipata.pdf
    • http://lesen-und-schenken.de/userfiles/files/30296336209.pdf
    • http://skomi.ru/img/files/file/35623270609.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/10a945f5604acd072ac23b3634592a4f/33835400365.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/21701124427.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=areas+de+figuras+planas+exercicios+resolvidos+7+ano+doc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be33.bin
e7460947d73f005535991eddf1da3e2181c2cef4da88a95d371d80d40917427f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE33 10996 bytes
font_01_sfnt_off0000d7b0.bin
fb2f85bd307c1161f0ff8732dd6405688d4fd5593c19797313825a909e6f9f4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 17488 bytes
font_02_sfnt_off000102bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16792 bytes