Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b89da8db48d581…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 01:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ced3d314aaa2f08e8f2ab443962d3e82 SHA-1: 62dd076212e09665bebe625e7466d37eb8c6b904 SHA-256: b4b89da8db48d5813031ccf586987f0122ccc101d430484c5c9f7bc6fca2ed92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=cours+habilitation+electrique+h0b0+pdf PDF link annotation
    • http://scvumaichiramen.com/uploads/files/jetadij.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf1c911838---luvumixuxifi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a1b409ae---50361851619.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108291923442485.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0714cc88---41420057656.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/bogarisabedidanizazirip.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/pilimizizegoxenowati.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uttrbbvett9uk8k45o1ohqekqp/58329135046.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/tumidesamizikezofugetev.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/fezudupoto.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/vavukatixulutipivibixaz.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13f0f0e47---54203202592.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2d96acac8---memujaxerafepasebop.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/sabegowogatejesul.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/64225123187.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8e115da8a6569d37ef1a90a700aa259e/10789180419.pdfIn PDF document text
    • http://agro-partner.com/Image/files/jazumifitutaxuwebanen.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/jadanuwiwororivamakimeguk.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/75533581971.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d08f2547576---37663174484.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/sutufedavetasegirejud.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/dozixifixupiguniginerejam.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/19998543950.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/4034287515.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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 17828 bytes
SHA-256: 00612d033576509449c1e0b7a2ad7952d771bdc2da4fbe66dd9b47ce0c01d056
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 11256 bytes
SHA-256: 977e6376d292846a4ef5fe7622525e62627438a2b32c7fc93663bbd26dd74843
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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