Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea83bf642f907b…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c42503556776cb8ee0d6791254f2d755 SHA-1: eb8e4577b77f8a11ed855e1b753e2f28a4130d72 SHA-256: 55ea83bf642f907b9a5869c42aa9d973fff2027f2e3a1558276a61f7295eaa72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a317045452b---fuwofumiloxaga.pdf In PDF document text
    • http://vagtteam.com/userfiles/Files/xakabuvejezikixo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e7d548f4b72b8a7e7a1b02041016bbe7/vewulimisogilupazagoxeniv.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/31720251301.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609208e472c85---40385802044.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/86ca2a9e720e7cd539fa6838df2903ea/92907767057.pdfIn PDF document text
    • http://usagimatur.com/files/others/wadexu.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/84783987609.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/vavivorulopafu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/60hphkvb0bfaf45fe10ldgarq1/93701153156.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be39c4d44---59135995586.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/xavupa.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2679b9a988dedf0128f41b23a0ac79ea/pifopa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fm7l1qol3o2iqpob9n8cb9p3ol/5979850232.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/temikegiwokipog.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/33861190922.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/18426954480.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb4eacec5---76712779838.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/lirapi.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/35345765082.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/37692725360.pdfIn PDF document text
    • http://prota.ru/upload/files/fefajakozibewumuzet.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/guxuvodofo.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/vodoxutajagonuzijorix.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57b928a02---45224765300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=student+exploration+slope+intercept+form+of+a+line+gizmo+answer+keyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/966d91809b2110d40ded41a1d25f2170/katajakewavifixuw.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 16436 bytes
SHA-256: 18f0c4b8c772b8aeed0c368fb58e88846d3666a0019b8dafa495e109246c9a1c
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 11592 bytes
SHA-256: aa92928188fbd30a65adebdd5d691d5de2c64a0f6c0439df447d385d31bc64e4