Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c08d991f40f88c2…

MALICIOUS

PDF

94.4 KB Created: 2021-09-01 02:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d9f6573e6f0e068edeaf62d311a8fc6 SHA-1: 344efa2407fbf1daee4b67c170f424c16000a917 SHA-256: 5c08d991f40f88c22a5db8d1efcbd8f4278c0a70bb38ed6baae49e2b9378b82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's purpose appears to be directing users to malicious sites through a collection of links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vanphongphampmc.com/upload/files/81399374935.pdf In PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/88187710332.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d78d838d3b---33745846894.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69616642775.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57fd2a2fa---rinikuv.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f4251f6e434eb87135fb1dad4ac0f11e/78875152509.pdfIn PDF document text
    • http://446888.top/userfiles/file/merodewosaxamumoz.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/6666285992.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/lipaxeloxi.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/20683494187.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/jomezakitosidipiwadi.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/nowabopemek.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/31005299344.pdfIn PDF document text
    • https://spacio.hk/attachment/file/jukud.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4caf6fc32635b1a1602c9d4caf51cedf/sejozulolol.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/25620688072.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/rimuninab.pdfIn PDF document text
    • http://geodez.com/pliki/file/pawov.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f3a6b6fdf64a394aaaa05302d1530931/lisunivexisomosozevuzub.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedab296fb---sirigaxumavaro.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607612b65ab61---93793001931.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/levanagutilesolobogina.pdfIn PDF document text
    • http://tipiland.net/upload/file/pemajenixugefaxavewalu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/53995013028.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8195a087a---pumuxagifulumopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+a+bimboPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 21072 bytes
SHA-256: 94f75849ef2ced01124cc95db762e5a0b732e193ff353accdc721ab6c4e4990f
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10124 bytes
SHA-256: 2ddc42b47f7ab0d01909c3f8cdff5106218f0d241d5fbc36c38c76211445ce41
font_03_sfnt_off000152ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 16232 bytes
SHA-256: 332bcfbe1d60e71d379c8cbbf929c3b267dbca5800f78657f6d5b2b22e3587ba

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