Malicious PDF — malware analysis report

Static analysis result for SHA-256 612988efce28c6f8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 10:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c23f8c17b4680a51f0306acd41e00d93 SHA-1: 65f3f48f887a5db38b6aec46333d0cef3c144165 SHA-256: 612988efce28c6f8284615d3cbb4392973451b75e281d0157f169c6c8a4a1eb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f29fcc7764c---kewabarovovuxa.pdf In PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/27959844517.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210825081341792083.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nakoriduk.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14d348784---lafikopedikov.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd47695e3bb---13052673751.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2541cc243---zonavijogep.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c09e837ac---51588669857.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/87782936385.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/jowajik.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcbfe4d278---72245742559.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/darapusesujedapiruru.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/18737941718.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/menukifopiriteniluder.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/463b46a5cbfdbf221d5115de463448e7/67642216978.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16239859154447.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124b1756ef---23493184679.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106011912184244425k333o.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/domabunuworewolaxujelijoz.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210814043332.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/bosatedatalasegozixuxulo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0a4600f4---30207699541.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/15de976eknc27509453u09oti0/46594201827.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210826050715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=iron+deficiency+anemia+in+pediatric+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 17708 bytes
SHA-256: 5db492b479f52d58e994b520e3aed9997747c450f266914fbedef035d51333cd
font_02_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 10632 bytes
SHA-256: 071e034027b3dc84fcafc4a3394f82d281a0275a39f4332a93a6cd04fcabee56
font_03_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 17960 bytes
SHA-256: 04b3e71a60717ab4343332c589cd4677f4dfeb84c5a1c3e2bff8ef58578f5fb4

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