Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a03d493ebf0c70f…

MALICIOUS

PDF

102.4 KB Created: 2021-07-16 21:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5ccaef5de1a825a009c20d865446154 SHA-1: 7c0ce82064b9ecb5a3717b3c285974e0c4591a30 SHA-256: 1a03d493ebf0c70fa7bd2661d0e0b554d6be566097314fe5569c71c4101e2c54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://choinka4x4.org/cms/files/file/4755211215.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31d5807fd3a258e8456004285b85d3ea/85948332322.pdfIn PDF document text
    • https://rinducm1.com/contents//files/76358106942.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/81771217824.pdfIn PDF document text
    • http://didopack.com/files/gibakugozikelibed.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ama857c6ga1ac5tlv80rtsof83/41720104015.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf8eef811---3935548991.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829f109b95f---61364174509.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607521cba1682---21490558893.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/48686185017.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099db00b4d29---rurozanimufuv.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738aca13271---34980389530.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/64615694339.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/74939633980.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/wopusibi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9sks4u4154vlheer1tcfflii0o/769734367.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/27274769286.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/56949404288.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/vekogumigevovoxuxanajobin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e546149f1---17236222187.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/vagekogul.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730aeb64fd4---99623704790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=us+dollars+to+puerto+ricoPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 18276 bytes
SHA-256: 7cefa31d58a8c47d460f1085745b06270834fad2c6354a81d72c4dd42b7c34f6
font_01_sfnt_off00015ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD4 10508 bytes
SHA-256: 950b25a7612b735bd7c6a7cd01834e7a02f576e3bb073959fa5196c4460dcf4e
font_02_sfnt_off000172d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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