Malicious PDF — malware analysis report

Static analysis result for SHA-256 e843bd37278b6be7…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 05:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6609829032829c00a410e636001617f7 SHA-1: e83f79df0064a644c0dae490925d7895d5ddbfc1 SHA-256: e843bd37278b6be7bd65349dd13d96db0da0d10204c53c64487b130311f339e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=epic+mickey+2+instruction+manual
    • https://thefertilizerequipment.com/d/files/25418958823.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c9079d17592999fe3ca4166687b791b/beniwijaguxoji.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c778fd668e3---25252721921.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bc382ce1ddf---redekekunomikut.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a751a2e41---59868364665.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6854aa32e---74559693810.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32835b9b7---84349651245.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/bipowopos.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960edb33375---91938468965.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5d5e1aa5630328703d09ce99945326d7/sobimimilowow.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f74da48edfb824e096b089ca7b535af2/14231602727.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1bf707e363c6c9c60c0f534840145c88/42828054300.pdf
    • http://fluidearthconcrete.com/userfiles/file/zigalixebixodumovi.pdf
    • https://adsbudget.net/userfiles/file/25777820470.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ac8cb0c6fd54f057d0e184bfe783c02a/75344502382.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/58d25f8d081ba890871b396b2a4b730d/gibisavozisijiriduf.pdf
    • https://myphi.biz/nbloom/fckuploads/file/34472017910.pdf
    • http://podlahypilat.cz/admin/file/guramowowobide.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a719954d081700ce434c95dcee222b34/duliba.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7a0d0afda31f8ea2248f2afacb8dc7d0/8980421091.pdf
    • 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_off0000ecf4.bin
fffb1a70173f6e5a78b6a49b2ee634f997c405bd090ebd4e077540689efc661f
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 18740 bytes
font_01_sfnt_off00011e7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
font_02_sfnt_off00013694.bin
f93349b2929d0c0333ab67cbba5e0979a5c27791159f4271ccd4dc82301dfed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13694 10944 bytes