Malicious PDF — malware analysis report

Static analysis result for SHA-256 5373e8b26dde120e…

MALICIOUS

PDF

175.5 KB Created: 2021-06-28 16:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16b446e2eef94ecb202c1e92d0f5606e SHA-1: 55e69e5c7c276964203e8065db7e31f64d545d55 SHA-256: 5373e8b26dde120e535eb6388a226e2a8039576fddbd5b7ed0c1261a72627beb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9049

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://garglob.ru/uplcv?utm_term=chinese+romantic+novels PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/35025322236.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3774460f3---navevopozufekubu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4feb1438e---jogakuk.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/virimixebokaxixamowaf.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef255f3047---53865683990.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdba1b3c0---bovazatumebowaso.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/budadotiriborol.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/3bf33c52cebbd319f071ffb4b93ce513/89733537009.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5a2aa62a---simamuvop.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/27914625529.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20088b75e---monewidufepabirofopolekir.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3e58a3d6---56717520183.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955d6c3a0---70958206500.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/99eb6686702f6df3482f6487c82ec20f/bafedotuboragebidubemam.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/zimunurana.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095357b29f1a---fotizon.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xoliboxerapebefanuvota.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/sijenovewipevisusababi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/75097342858.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d0184835---20229906848.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb463214---zavatazesuxoxudavurawe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a75d5b5488fa8560b0a52238ae81cb/33842067098.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de312e670---91416549613.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F5 10592 bytes
SHA-256: 5fd5a90dec6b9cb920d40192e631501caa1844f5d69e302b51599dc7dc602506
font_01_sfnt_off00015a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A00 31184 bytes
SHA-256: 89ac92ad95527a9bd66f816f75efd59853f17002e9c9e238cef17c26150a3fcb
font_02_sfnt_off00019949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B157 89984 bytes
SHA-256: 756067d7d3df541b4887ad54f22aaad632dccff124b738017ad578ca23e018bb
font_04_sfnt_off00029542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29542 18536 bytes
SHA-256: 1a36d54d3949e9c054a8498c22efd69171ac735723d7eec70984be3fab92aca4

Open this report in the interactive analyzer, or submit your own file for analysis.