Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab127940f9c4f721…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 17:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eddeef5585b004b063ef11020fd7526 SHA-1: b10911888da3fce2d612830fced8029027b3fb02 SHA-256: ab127940f9c4f721b8c2d677ce7181e296eb52b6804169c98d724aead1370406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=plain+popcorn+calories PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136538aeb181---ravikesi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136980dea74f---78630885846.pdfIn PDF document text
    • https://coevent.ru/upload/files/9097898049.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ada0a56d---xuratupogozevup.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wegubedekuxitoligodigupu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/teputeniw.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/vurabonufumokut.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/masenukamagafajeronemano.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/weferimidetumazogokutexar.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gubiwutaketixu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ade1cc2b---tagaz.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/24923823246.pdfIn PDF document text
    • http://reopen911.info/media/file/36578175465.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gujemuwigamazitimef.pdfIn PDF document text
    • https://norservis.cz/files/files/24577482837.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/93334810517.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/39586153660.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/kalikimudulukade.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/10083376235.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/15362361322.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zomusoto.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_off0000b641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 10268 bytes
SHA-256: 72d7e1696aaefaf3ac3c075ac95b0bc3a001e54262d93c1241fa41c4348bb472
font_01_sfnt_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16052 bytes
SHA-256: 95ed993ddc8ce3a498f5599fa0a3678e2493aff7d9052e3287b795f5aa871ee4