Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb48a15cf19fd88…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 02:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3077dc43128fcbb153d48a7cca06ad3a SHA-1: 8c3f5c6c0df013b92940c3fe21120db2c3ea2642 SHA-256: 1eb48a15cf19fd88022e5fc4a23c10ef19cf04acf4ab3568f8e547993fe3a56a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=osmosis+inversa+proceso+pdf PDF link annotation
    • http://misosmile.com/upload/editor/files/66936922037.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d02dcbfe7---98509818040.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/umhk7t027cu9nbn7qank9bf5qg/21847526649.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/60109642882.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jirotuli.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/90n5g4c87cls7k2vuphg8hs1oe/wojabumulitutik.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/a7b5696f438c62d375730f18dc62d762/jizuzipilusewasira.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/48487643187.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wozudadujujujomiku.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ofdjc1r03a1kfdv90rrhm538eu/77322771858.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/rexaxo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/86ff1b0ce47432c4c90fb5a3168eecd9/vegigojozojobexo.pdfIn PDF document text
    • https://patc.fr/imagesfile/kimijugopezozizo.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/ubomtj19uo2sj4sqsiu47426af/nibasabimawarutijez.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19912403985.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/ketolilaxiwarefomoru.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/derusefafu.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/84938843931.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/61087466954.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pelowem.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/karaz.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4a3f222c1a63abb61341d962ab17cc41/xawoxalabinulobubezazajor.pdfIn PDF document text
    • https://epiphanych.com/images/file/jerirusozaduw.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070105785a5f---kobojale.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e6030f91---lavubujamir.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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10728 bytes
SHA-256: e4725fce87acb7b30c8144cc38448b4b452b1711d814e088b4b731703f5b5fb6
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16996 bytes
SHA-256: 9cafed19007e13aab29cb5f9e94d5ca42cc40bd211448158bb21e7b674d47305

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