Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cb300d14f88473…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 01:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d44cf570ce3ddf26953dd839cbf10add SHA-1: 232085c38e7404f8c4a263f0f91dc3dd646723ea SHA-256: 25cb300d14f88473ead416b3661f919cb7b42f1373f9c5bd04c12283ee00e168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the true destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/am5k6bm373p61ra997r35vd072/pibojodusurakowaxa.pdf In PDF document text
    • http://antonioruizabogados.es/userfiles/file/barupojemesavuwitime.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/23699681051.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_0037F5D106CAAF8D.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/6823537482.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/vafaxulagixazodateneji.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tibigebozobev.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/rizabosuwibobipoxeluz.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tebud.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/52267139960.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-21/d716834e0c74729f03b56626f26872d0.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18370187595.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/89695434070.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/fukizipotamilukifidazep.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/66030135039.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/falotimufavafizuluvavo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de581ad371---24090650834.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/11602375619.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/71376642312.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/41126322597.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/91427964621.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/tekazo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/140101ca77de1bd1462374310433fad0/zonigidagusuxofotixoz.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/43952588924.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/parakuzofemitugevedajepad.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/nubutixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dream+league+soccer+2019+freePDF 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_off0000b7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E8 16440 bytes
SHA-256: fc88956611644fbaac14492a5088727d1a68a892a8c00d4b0c9a117979c13324
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10948 bytes
SHA-256: 24d36ff8e293b646e650aa92edd31c673e5a9a1ff4c77134cfccfa20dbc0f114
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1