Malicious PDF — malware analysis report

Static analysis result for SHA-256 5781bc5e507e6fe5…

MALICIOUS

PDF

94.8 KB Created: 2021-07-30 21:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6d0c11a869989fd8d10fa8c20413ea9 SHA-1: f498a9a4a8062d1ca6391f03b51242605f8bd48e SHA-256: 5781bc5e507e6fe5c57302c9bbe6d6058147c75c90f1a370355c9b921e9146eb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'SE_MFA_LURE' indicates the document's content is designed to trick users into providing credentials or MFA approval, consistent with phishing tactics. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=carnegie+learning+answers+algebra+2 PDF link annotation
    • http://jarosi.hu/files/file/84304035077.pdfIn PDF document text
    • http://fedime.org/imagenes/13016934723.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8f723a8bc7556a663a67488b74f1bd75/29904578215.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/050052095385.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d522d59643---jagipasoxabumadepupuxig.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/427aedef31a2253b0c64bd9cb4307e17/51338626473.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d91343c900a6877ad4ba7cc1878184e9/wivadigino.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/njpqefrk21tphnplmt1foufqq0/88930166210.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b0na3f8t6ciku1ik1c2dct9not/86803279617.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0580ee47---48483767093.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/32251819143.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tawonematugejizomajebeteb.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gedozazuvegige.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c0049074---40072350499.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/81884892731.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d395b3dd9---melabopo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/66854644308.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/39534aad723ce6de2cd302117024865d/dijibuzefizemamapuzew.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokaxutabaxolove.pdfIn PDF document text
    • https://ismart99.net/upload/files/33750951038.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a155ec747---jufilawutetotuwo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c18c138c0---zakabofofugaxe.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/dimilak.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/sanure.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/43801905230.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 17660 bytes
SHA-256: 75d7336b47d946e1d4a4ec5c368e0edecf6968363f2e039c09c9cf47824ac2fa
font_01_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 10444 bytes
SHA-256: 3f6964932b0b569bdc56cddf2b8e76c3eb3211ed012343015db0c0198c1216fa
font_02_sfnt_off00015632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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