Malicious PDF — malware analysis report

Static analysis result for SHA-256 663787a119ba63b0…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 10:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4f1b19eccfa669edf638b4a858e9977 SHA-1: 95be7b7500432909f499becb2867d614f15090d7 SHA-256: 663787a119ba63b0f1a9c4f01c7db7f99676b49e2098e597913a14ef2410fdfe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160778e42a8200---simemidulopumelas.pdf In PDF document text
    • http://sitoad.com/bbqjoekey/files/202106181551596205.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/savozinusiworixojosi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/23qe42kp51qq8r8buqsvgjsn52/tebowilevubimarupi.pdfIn PDF document text
    • http://jar-ted.pl/file/kidudulusibafok.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06be07c6---rovoxaziwujafitejof.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba11c7413---nuruvuxesuxabid.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bc2bc4a2e86a25fbe94f0e9826df0880/58190872494.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/nemaj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4cc18951---90095430566.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/29353056875.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3fdf28071a0dc031edb6fe769b416fb0/simegakusameto.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/71b8dbdc4395d1f998b2ee4d4e9dc9e6/nixirojidej.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160904d9ca3fa9---22247515673.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/barefukadaju.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/07c335e114f000059de3f0fdf949aa4e/bopegelunezedudopife.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a130031fde8---13392591682.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00899e270---97210451056.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5939cad6---josuwulipiwisigolipe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/274610fcafc21b3d8cad1e09425ec465/64606764518.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d9f45e77---nobere.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217cbe3279---dudemamipexu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67952d0e1---fitug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=i+have+a+dream+by+martin+luther+king+pdfPDF 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16928 bytes
SHA-256: e3b6ca21bac9fb05dd81701180248bad2dc56d5ab4787903c8f98f258ff97416
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 11120 bytes
SHA-256: d924e784245798d55e3101503aace32f198326bf43fd810d617add22bc70f0f1
font_02_sfnt_off00013439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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