Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e2e5ac81e07ce9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 15:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 927275af18cc795066189529bbed8460 SHA-1: 4d0ba893ec4479657fee6b2bf328f439e61eec56 SHA-256: e8e2e5ac81e07ce93eee2af3d54f655a4e44ed35fa26c83b1d95d153fe145180
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites with 'super-forms' or 'formcraft' plugins, suggesting a link farm designed to host or redirect to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and link farms indicates an effort to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/251de99d619ff1383469381a6e145736/valibisudesenezizetowugi.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t64e3enlf9moo8kea5ijj35vts/53495489870.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n3rvshu9so23rahqu6meec4vv2/nulufowifabam.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145bf35370---sazulomipugotalovamef.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5bf423e8e71b4389ab1c25a47fac6e74/17924484695.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/46d8d233b5d07922911874ea98432020/gatuvovutavufoxajam.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/vedafodakuzaxetijepep.pdfIn PDF document text
    • http://slsnn.ru/content/file/noladofev.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/99913693743.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/fakewodatemowikafiwa.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/70759458947.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/kodikute.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b366815---buxexinozekesetakejigox.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///virosevemoruwapobuxa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/i6etahrmbc3fmvch68jssehe11/50035334344.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-23/20210623033636252908.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/96491432107695c72d9a5cdd98bb0385/91455640463.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609788c202f35---53252851797.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedameb.pdfIn PDF document text
    • https://bselink.com/userfiles/file/71433151687.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/guzizo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nofor.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/fa5fd9dbacea7959e1872886613d6050/jutevawowedegosupinuroxi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91050691679.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6063d9c20---94471051909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=el+pensamiento+heterosexual+y+otros+ensayos+monique+wittig+pdfPDF 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_off0000ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 17292 bytes
SHA-256: 4b446eba5894fdc8c3dbd2a751088012a3cda1f0d87a74abce2bd5b4712d68da
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 11476 bytes
SHA-256: 4c2b93ca4490b4d51f77b3b9449786c1be09d883bd725a13b68a97c068e8ef4c