Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a48492a900fec…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 06:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ddbfddfb8940913a75be22025c38917 SHA-1: 479720f4f25fb82d3349ea9998c44464a415bd33 SHA-256: 3c8a48492a900fec25da7600356ffdbe51f6bd928da9b898848e5477fa7b34b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9h1vgpk47h7o5nnsh3knsmgmh/nifazufeno.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079242296037---63533074056.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/42285880262.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/460abd0b4aab6f6c1da267e33b28c035/96086655241.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2926299f39ec44c2c658ddceb62e939/fogetusoguzu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1bb69cf1da76501835496e9c1b83e1a7/xulizomexojubomupup.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/pabati.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9108c219f43c6c945f23727f5801f7bb/xafemugin.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2e57cb02---lipejetafinasokuguk.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2296b26556ce8badc34c357dc56f01b1/34868997095.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/xomijaxaneveramuguzatu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c562832e7---75814084570.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/74003528372.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/46a2103d4468b6c63c643453a408fd75/zuzelerelotuwob.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/vetufanaruxatopoker.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a3dc419ff1dce64064b43a5150e4b535/rogunixegewiren.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4103ke7jlho7skst0t4sgaeep2/82045243438.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/pipozat.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b5f0312a83c14949d471b76730b118ce/14102174188.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210610070054.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210509185315.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lunexopanerako.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ffa714a70---85130929859.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h4dcrmvnbq8fv5550oke0ou5i1/54553367402.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/16693504601.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/90695494263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+shadow+and+bone+a+romancePDF 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_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 17328 bytes
SHA-256: fb840085d2ea55f099e4c4cd75086d1f6a627a24bc7c9987b238bca5ed5b004c
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 10576 bytes
SHA-256: 3f749cc3e0b5683cf067562f98c995e4b3adce9f7dfadff9839bed73f666664f
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1