Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96210a94b3c751…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 933bfe4163656c477a504319295fc4e6 SHA-1: e5596d932d7e8f34d97c077e30864d92366d2d05 SHA-256: 4c96210a94b3c7515548d4f8f9c0a5e25306312a3c95ee7db39f9472ffb90016
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=structural+analysis+aslam+kassimali+solution+manual+pdf PDF link annotation
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f626deba884---sebadivesosaroxiropob.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/57856405001.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/152315308450.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/197793844.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210608165814.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/33956137695.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad68587d8---77324742426.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ecb0ac69c292c423a41f766b654ed8fc/totelikin.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/dd8f853cb202619d17ff3287932171bd/32169549014.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/puxukikazawufofog.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb3c2b3f7---60051013942.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nojgdgapjqh0qcke7cfuf0ao9e/4382067779.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i3pkkeddrt63t7g0t6k16d4hr9/72880431848.pdfIn PDF document text
    • http://mav-auto.ru/images/file/11462521810.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wapotemawe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90d04af2a---marogajawodebogezexe.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/12955767473.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48120146710.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/61607588088.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/sewufepazokezufareso.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b30b9370---30670622235.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e5cade4f---91803447763.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912b720cd01---sawedaveganufejiruronol.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gotajerurebegefigivarafex.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/8311125413.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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 16980 bytes
SHA-256: 590b6c9c0d743d87a24f92799e0ebcd51bfc7a450d4ae6bef157360e18972535
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 11028 bytes
SHA-256: c362d9a0dc902d66433d727335d1154b7ef84e867d5dea9157b5bd695ccee5b1
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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