Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccbbf561b43fbbc…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 16:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1574f94bf5172c93887aea663e6f507 SHA-1: ca8df3bba09bf1d5a159d902e6fff23915ad270d SHA-256: 5ccbbf561b43fbbc10302a8870f9c8cb951ef3792b13ee63da16c6eb8c1287b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3316be3b00---67920963938.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/cb57be1836c867a806e61d19eb5e5fa7/66423886636.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/6969801231.pdf
    • http://colescastle.com/clients/875019/File/gajadodomodelulifamem.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/92903893465.pdf
    • http://angarakshaksecurity.com/userfiles/file/puviwusi.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/st1o5ankthatsadqokivqenopp/buvosojijibaxuxetoxinefor.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/319aad840dbe4d62a4794459da74fb49/1547763391.pdf
    • http://hawks79.com/clients/85064/File/51231189998.pdf
    • http://artin-intranet.com/ckupload/files/9016248477.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/sozugikomezirini.pdf
    • http://ruoumoc.com/upload/files/pedijalavowa.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7esokrp458cq994h4o9fr9j9fh/49381993851.pdf
    • https://vibangnhadat.com/uploads/files/68875530594.pdf
    • http://studiocalderini.it/userfiles/files/sipefifumomasodowij.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610937faa4a9f---48888593679.pdf
    • https://123natura.com/stockages/files/78471080948.pdf
    • http://refinerlink.com/userfiles/file/suxezazel.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/336bc8eda09d8ff347b126c3c316e2a5/78821631191.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8bd149d337227bcf547318c1c6d72803/50890180908.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4088d7ea43f81f715d158d078aa1a36d/buzepu.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160748b4ce99b7---didawo.pdf
    • http://pitin-akutsu.com/js/upload/files/bagugijijagewesalo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=health+and+vitality+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c6.bin
7c009ea9049e416ea5da7c5dedaf8373f078ac9927995e77b1d01e3f2bb35585
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 10476 bytes
font_01_sfnt_off0000fa12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 16792 bytes
font_02_sfnt_off00011224.bin
86c23775b77acd14c785d40f1aa3ad9b41a9be68c38d412d97433b752518382d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 20700 bytes