Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b15eb2317871b38…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 16:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb5da0c33e85957ca65e6f3742f53ca6 SHA-1: c1cf0c42be9f1670141a56305c70462766e5025c SHA-256: 7b15eb2317871b3876ee5cc8d0bec50bbbba975a0192defc94c05fb084b96d04
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or credential harvesting attack. The heuristics indicate it's a 'Recovery secret / private key request' lure, combined with a 'Password-protected archive handoff' lure, suggesting an attempt to obtain sensitive user information. Multiple external URIs are present, including links to compromised CMS uploads and link farms, which are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=jenkins+plugins+install+manually PDF link annotation
    • https://aspit.ro/imagini_ws/fivelixisuxu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8ff4e770---tarofonotulevaboxiwepave.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/satogow.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/82916201090.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/vefajijemugoxegebewan.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/xologojekasibiwuviriwixon.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pb9833479jrnakainpquqhosok/luziwugibamowipo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609466f0d95c4---fabufofa.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/rolatamapozapevugaku.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/gunubo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8ovj547dcmjnui6hmq5rhprfpg/58009744826.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/sutusuwa.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0d4d35d0---34386225589.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/219aaf3d8a3c1615e4c14252ea094956/fakolelesemunera.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/1062294822.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0840dd4b---toduzazal.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9ujbtueqf0qncg6gl3iqaugc4b/zarujubufisezu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/45ffd8e1e7f2f070ba6c62021df9d961/56296639977.pdfIn PDF document text
    • http://unityproductions.com/upload/files/36541345416.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/91529069564.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/gexodugiluxelinir.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b64793fe1d7b31731e712a31bc8ab44/sugasuvebeborikigazifewe.pdfIn PDF document text
    • http://elma1.ru/!upload/files/fulejovutafolagarumul.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/14818490991.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 10672 bytes
SHA-256: 64b21093e4121f6b519edb41a9f1236ee148b876d9ff9425fb0e1950fbac20e8
font_02_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 18252 bytes
SHA-256: 6163da9a69d9ed449819deac4c7e9728b71f53818b6f58735752578d62598b56

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