Malicious PDF — malware analysis report

Static analysis result for SHA-256 24032d78a1e030a6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-03 05:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f060b12f574328c9a0aeb0a114a3305 SHA-1: c393ae198c8f706d1d95f3d17876fbf1df0b7a68 SHA-256: 24032d78a1e030a634ffdb55feb109d95930418f67515bd4b41bef7437594e38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=dutch+oven+peach+cobbler+with+cake+mix+and+sprite
    • http://csc-021.com/userfiles/file/20210624015835_42k6za.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95f97ec19---70953762617.pdf
    • https://hondamienbac.vn/userfiles/file/55872262712.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e10ab6f0858146ed79237175e88c25c4/91739000887.pdf
    • https://kartplast.com/resimler/files/19387545497.pdf
    • https://pui-vital.ro/msg_media/file/tolidu.pdf
    • http://thunderstar.cn/userfiles/file/20210507102506384342212.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b2fa36c5---19313106104.pdf
    • http://jinistudy.com/_UploadFile/Images/file/konufafuluxavi.pdf
    • http://derma-dts.de/files/file/53191479952.pdf
    • https://noithatkuongthinh.com/uploads/files/wowigekogeluwonevezizumuv.pdf
    • http://phantasos.org/userfiles/file/kurewifeliraberojufusavu.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pka7kb5gd0sbujl4u8s22rp5qa/39064821190.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160913ba97c964---wukuvos.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/euo584ujvourpqpfamrco1sn00/90474695415.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/83264091767.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33fee7520---34550827669.pdf
    • http://amuseonline.com/absite/userfiles/file/64473732116.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227c70466c---10819165594.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/62009836666.pdf
    • https://fallsplat.se/file/fudotapoxemadifozu.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/23100071085.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26fb9f553---71457071973.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3341d2bb2cf1dfc6aba9f53e5c8bb3b8/bilujanolilonepi.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/032758d817db4aba590e71221b8dcc31/wajopewezitilasurok.pdf
    • https://brs.jo/userfiles/files/28646559269.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fde6c5499cc35aea833cac2cc7fe730c/mirubuxubatamevupo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 16792 bytes
font_01_sfnt_off0000fe6d.bin
cc951a286e477d7e5f3016f4af0b6178026954079e5d4b79b71010b43e7c1e85
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 16832 bytes
font_02_sfnt_off00012a18.bin
b22dd187ad434f1554d10d09c375f38a50eec1bd9ff2cdba1e08f0f02a4ddfd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 11364 bytes