Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb7e42d398f169e…

MALICIOUS

PDF

124.1 KB Created: 2021-07-31 02:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f35545036a48cbfb3d6c9702b5c3be73 SHA-1: f3c27af000771e7e6c1d0e36547e9bf634cac81c SHA-256: 3fb7e42d398f169e5f739794a7175f5d28b6afc3e5a029680499292a5b0da0cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://huntic.ru/uplcv?utm_term=los+cinco+lenguajes+del+amor+descarga+gratis PDF link annotation
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7sjcgpbj7bj8h95d7uv0bnjv63/29361970618.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/44800460511.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/wogewodiramewiwopilag.pdfIn PDF document text
    • https://jotelek.hu/files/file/84013896745.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/vivavasija.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/h147n0lvhbpbkbla8tlb03r38t/3108943898.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609443a187909---21193423927.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3227fba2---vezojin.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ci6u1ng09qttqo2jjcklvse7da/tanolixe.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nafozisokarigubufolimini.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1f7171274bee2ac34fe3bc9a0c30772e/dalupepukifem.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vubodibelunewiwedetatu.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/tekevot.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/zonudujawune.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/gofetaripogir.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/morukarevevumepogek.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c0drvaq8sel38pd4gf28t9mc9a/xexukapibujafis.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4a62267d9e85245adc91dd074dc5d4aa/36897118480.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1e7a5c0f---xivorobuweru.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lqk32qknigrdf8rfuv8qiqkilg/fejopuzigawujurizup.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105242043106984.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/dixajeferafi.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210731_BE204224B82E8EB2.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de3f41567---fedaronedugonegerubibon.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a141139b8d6---jojivozuxagas.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/18956677948.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_off00017ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED0 19516 bytes
SHA-256: 975e58be61f2dc188c38c1b4961809ce256c5d028d7edc21e375cfbb8014d246
font_01_sfnt_off0001b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B4 10900 bytes
SHA-256: d2636f3c4d0f74ace01f58c7602693eb8359d2de5cf9e0595701678b8a28c838
font_02_sfnt_off0001c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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