Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bedb1ecb3428c3…

MALICIOUS

PDF

82.5 KB Created: 2021-08-16 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8317faa12179ed664e693c5556c8e39e SHA-1: dd971845ca92fbe6e01e9b4899b02116768a210b SHA-256: e4bedb1ecb3428c3d337529a46cd66c773012cb8b7b32b38efc23cd8191ec8e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or session tokens by mimicking a multi-factor authentication prompt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, likely exploiting public-facing applications to deliver its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://sro52.ru/uploads/files/1443735745.pdf In PDF document text
    • http://beta-rc.com/upload/files/majazanobofiw.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81186362478.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/71660173266.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b512693clgoled4o837bu9ug32/gabes.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2518246109.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/52031884625.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/barufuxerewuripejiwaridiw.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sikufavijedomoji.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde60a6214---rexukadigosudali.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/kuruwedovojoneju.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/27f3aa2567454abece46448b28599f7c/fudupunutobovejematuw.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cbec5ecc---53380547623.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/mibawexiwemorivinu.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/k86l2dakajlhhviuq8t2hvc3mj/jonar.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2742855c79d137866dd06df6d8a2f907/kudemopowezazoresajibe.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/74406734719.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16083838ad55dd---gamimotivu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/nanizumi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fddc2c6a552---zulireji.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/38293659407.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d54818dee32f6f2e513440fe0da0dcb5/46786356185.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16087f11cd4ade---lowuzudedafekolel.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/mepivox.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/gababederi.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ae0c0a2ea049839272a488855f1722f0/wadeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=netgear+n300+wifi+range+extender+installation+assistantPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16476 bytes
SHA-256: 8d6866f747c1509db19cd836154f404f431c03973d8cb323cae0ecdc21f5fa55
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 10988 bytes
SHA-256: 63ed30ed4fb32c5a7f3333d467a4567c0901bb1208e561746c958a0459b4663e
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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