Malicious PDF — malware analysis report

Static analysis result for SHA-256 57de976a3cc3a5f3…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 00:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bb944c05086cbc2f7f0fd6a96de145b SHA-1: 530587b98e8014507abb14e2c7e8a05d95e67c46 SHA-256: 57de976a3cc3a5f342e5ee9f0c33e874527b75c0d9ace910305aec90e3a979ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for SEO manipulation or to host malicious content. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stoewebdesign.no/userfiles/file/31938203706.pdf In PDF document text
    • http://richfield1960.com/clients/865265/File/laleveti.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/363dc78f7468b7f623080558e29c4df2/fibuginirololugebe.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c448f7b1ade---dapugodupeguniza.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/nuvitofapefefafebekakun.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5abf177d6d00d10d6e43333cb218150/32347115383.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeea8f954---tanaxurivi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6700571fba---99347215680.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cba56d8d921---34909537420.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/44598957023.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/83088890660.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78709772010.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/mqkos49edjjo0atbfmbipf05oc/rinafobuwusunepekem.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4b2283563---95690481147.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tm2dkc8q5kmh0mpv234ro65ovb/soruwuvo.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/5735144135.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mcb9i4gq3nrv2107rhpgh1gaa2/5678375814.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0fe1adfac3865eb16695e19f4eef591a/gaxevawozowu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bb2e9591---62686784494.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/neforuwuzogutan.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/pozuf.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4afc29f25---37097622756.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qbebhkm32u1tl2p8l0hl97ob7c/vifakutamaledixilu.pdfIn PDF document text
    • http://unseretochter.com/images/file/wusijorimuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=incontinence+meaning+in+arabicPDF 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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16520 bytes
SHA-256: 5ed448f45605e0de9f480eda88662308f8cd38ee9285409c61698f2da26eea56
font_01_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 10452 bytes
SHA-256: 17dcd7e5ac0c944c93967363e9146c1d08215bc1b30aed0ba101919bbf19a36a
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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