Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7640b00bb2deb6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 19:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a76bb717663c81171039333f552373a6 SHA-1: 3e642066d91c2b9b1abb09edf64637d529423a90 SHA-256: 7c7640b00bb2deb6d8a419d4018cffe9b1d8eb25a67fb8bf84110d44200e6923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites via the embedded JavaScript and link farm. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF suggests it's delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=taste+and+see+chords+pdf PDF link annotation
    • http://topspeed4wd.com/ckfinder/userfiles/files/53725002177.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e27df2e49070b7482bc05839b7738f0e/pofimikuzivusupalisopi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/munirowigatasude.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nubipekajirokamibe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c8a539a51---puwipo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/31068764219.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565f0ba2ea---xumukozikilebupurutidov.pdfIn PDF document text
    • http://chamdure.com/DATA/files/71390533102.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/irik0pt9luf6rohpeuq65osahk/52156650734.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/ruserivojeborodojudu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e7409ffc---wibukilum.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94a2b914b---40835454587.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddebf20e3e2---legezom.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/42725106383.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/fakeko.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/62266f1aea14eb3a5a6bdf04e79aba7d/59008829980.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/8110276289.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zapupoluwivozidusop.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2545f710---jawidudefubitosonesexum.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/21652715990.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c50648455b6---91313341762.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i0ab6l5h66c2i4gg3nd6n976l8/97598459691.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210706065023_80pu98.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lulevugugimopugeregar.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/77697349961.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10540 bytes
SHA-256: 5a426ee0afe6c1e1d8c4c28971ceafa4600d6e14d658cdc2257100d6ca5777ae
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 19916 bytes
SHA-256: 329cdc34670b210d9e26a3fc5740cd816556b51d1db301d4fda102ea1c7883fd
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1