Malicious PDF — malware analysis report

Static analysis result for SHA-256 8435729f11957e56…

MALICIOUS

PDF

93.7 KB Created: 2021-07-30 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 374c23de48ba387e95d9028f298336f8 SHA-1: 478155757eba2db913b3216fdd17616a4bec4b15 SHA-256: 8435729f11957e5629de6d0e7555479b76df53e04cb1692a619e870d33b3cf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tokyoracing.hu/userfiles/file/49778790245.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/42fn4qdke8msiuhnc7qohv6et3/35227160489.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/28293191868.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/16160553903.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/tamigufixawenozeno.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/95879531946.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c16b1dc4e---jobomavolikefenobujasifa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89h1kst95qk1l86lkqhhoua5b0/makozinufiw.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/wesabiwetewuzokum.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/wanakosazukisazuviju.pdfIn PDF document text
    • https://epiphanych.com/images/file/sutolefakixok.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/64184954705.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9a4f147abdca227c0854df3e148b3b3d/542123054.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/karenunub.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e193d5913c4961d2f36ce77edeac271c/33777148581.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/24763090819.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/nofalirovovulopilekuro.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3e16f9c04451e35948011712c3201624/dakufajijuvonuvovalajag.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/28144386852.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8302716b5d---xunonotunabuvinelo.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/tujudebixapexojub.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d2727d36919ec6884e77bda155e38db4/72240638877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=luna%27s+fate+modPDF 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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 10368 bytes
SHA-256: 0f825cf569d0d1c2b3ac1c8a21bfe9b749191bd5ac38f237baab464fdeeda9bf
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16220 bytes
SHA-256: 132f05ce40ac9038317ee37a5988612cc6d75431eb485d801d5d4d5d0d706cfe
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 1796 bytes
SHA-256: 6901138c3af066b350806e2b08ea0f19f42d7889a5b101633ded31ebbc0a5201
font_04_sfnt_off00013899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 17904 bytes
SHA-256: 5a8a8bc3a5e931063012265d7a49b517f8bb4b86c372513708f9405a3cdc9689