Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdebdea1ec40b32…

MALICIOUS

PDF

97.9 KB Created: 2021-09-06 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fd3a96d4c7e9adaa49cdfca9017bf44 SHA-1: 3c6b6d17e185d4dbf548671cf2669e765cf40ff8 SHA-256: bfdebdea1ec40b321f623b3ecdd9abe5bae7506e5127651804f53ebfe1fa59d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=probability+with+martingales+solutions+manual+pdf PDF link annotation
    • https://kund-in.com/userfiles/file/86623899048.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712926d8a23---nerijubesu.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d4e520b66dd17faf422d4b2df3124128/sifibosu.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210820_A1309D7D682C0B68.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/72800314167.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dekupobaru.pdfIn PDF document text
    • https://tangentemag.com/img/file/87877597582.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/revotidu.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/vomosolatububizisuvok.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9l8ard9vvai8729jq3mle3tb69/repolavelulapiku.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/icdrmr24t80tenmr489ptqb5n3/64222219771.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/zofadosod.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca87c35a8c---nekel.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/52949090199.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/lusufiweko.pdfIn PDF document text
    • https://noddy.nu/images/file/sukonidokemegizufokuwe.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/29802793014.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2okmegdai7emjv7ggje3kv1bk5/37203649834.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lasokofokije.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/27760888437.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/57498168396.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/dimobufogewelixosavo.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_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 11388 bytes
SHA-256: 1d4c7c0327d0e3a85871aac05c8c94431285c461b159f3b0bcc60b3a8070e50a
font_01_sfnt_off000131fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FC 17880 bytes
SHA-256: 4261195ddb674712f19d473554a0242eaf67df05c214a6bcf4be33003a12e1c8
font_02_sfnt_off00016143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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