Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76ae0ddb839e954…

MALICIOUS

PDF

71.7 KB Created: 2021-06-29 18:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be677b785bb59afe6b5333dcd6dab758 SHA-1: 456de5eb660ca6145ab7f6662dbddb4cbd07c502 SHA-256: e76ae0ddb839e9545093e033dba2150fe9133e0ade19040a6672b81e81459c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to lure victims into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=the+charlee+hotel PDF link annotation
    • https://reparation-mobile.net/userfiles/file/wodabuzirivuwetifebes.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a52e6fd2---wodalo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93a4a1be7---jijawapiwese.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/wulozanozemaduvi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2943cdcd---gefajapab.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105180108245938.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c653aa1258---jodawamejovonetimumut.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a00ac44040---kinifam.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a58ba1795---rusuredadanojowutixoz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/19ljd8737r7dhj50m1sd0j0s44/22967217157.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/26996277958.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/fanegumumusoleveler.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/lowojedet.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a4da400---wisosomajulafejotavev.pdfIn PDF document text
    • http://slsnn.ru/content/files/76545300029.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6240d72e---lejomusunisuf.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d2401a967e8e7c9e78048da4eeca03c6/82493440507.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xuwexiseneva.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/82q7549dprqfd9cl5ebo6d5ka1/52971588676.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160917657cad45---33538265783.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/45835979935.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890d3bbb079---28427687903.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3a2a58b38e02b6be57f7346895ffc9bc/16137806451.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/durizafa.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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 15816 bytes
SHA-256: ef22cdcd664fc4eb0a738156ee6a832a59b632c99c917d7f4f9c992f3f4f99b1
font_02_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 9924 bytes
SHA-256: 65a47d6aef29768feaf309f78047587ffb7a46c09ce6efabdd886aecd3ba5795

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