Malicious PDF — malware analysis report

Static analysis result for SHA-256 38be265d77aba47c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 13:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82934b91bfabb2cf22ff5a2c7917ace2 SHA-1: 47c34d4f4b3ff4d70d7970cad9a1ff08e297778d SHA-256: 38be265d77aba47c56a534d5bca2beaaffe7f66faa84084a7ab7cb4c607eea73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57b26bbe689bcce87e5550d43530929a/zejariluzilaxelas.pdf In PDF document text
    • http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794388b25df---tegefabedonulituwekex.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/32d40da04ec625b90e456ed821bc7dda/mumuraxunivetifurimiz.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210803090439.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be38807043---16690128142.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2a406df8---turexetaziwoxonete.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/45026645682.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/76340081946.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf93f00c7---jigezifikavafugogim.pdfIn PDF document text
    • http://orrizon.ru/images/file/69586736240.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a29c5b47af54b85a778144ab28ee7541/bafawago.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/oc8pumohs0jhpdfs2rltlhu780/5110068765.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/22322534583.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107060545421329.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161124c5e75263---27743663621.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f116983b---nulevevux.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/70234d260c08b95b75f2f3b66d39ab79/kadopebewis.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ledug.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kobij.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vobap.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/zumose.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071758184042---53751042948.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/jutapesepelimowoxabif.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/761e6f840b705c6e62a2a2dbab425783/puvixipej.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/46896612003.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/digorufej.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ae713104---dasuzezadifid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=undertale+apk+download+androidPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 17376 bytes
SHA-256: 163b2f4484a2fc99b14efb6f60443fd83abe5a12ee997c617f64648f34c5f3d2
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 10400 bytes
SHA-256: c89d25c3bf2961e88a05dff27054830ba512b545c4167ed18f62ea16308919ce
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1