Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdc7e27e749cafe…

MALICIOUS

PDF

93.8 KB Created: 2021-07-13 13:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 076542c21f5114c86a860c6df0c6ee3a SHA-1: 0eb417850669c7a65ba9d7141720114f76e59c3f SHA-256: 4bdc7e27e749cafef5f7a7f259a6b2c34c10782e443a5d2c856df0db71a27a19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the document is designed to lure users to potentially malicious or phishing-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • 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 http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/31877938660.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e2a5bcc0---61521768580.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de0d3d1803a---7756876363.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/positatovasut.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095bba1388b4---zogabusizagobasubuni.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/24903196.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/46153785161.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a2c3e48ebb3569a653e7ca51bc6add0c/ruwufazi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d7c1af2c---biritugoxolakazarowofimal.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/85qcj74hsgasv1gck7on3ljfk4/23368170498.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tofataw.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ef627c081fea02cfa7317262206c6fbe/25958949094.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0bab6b26---korutevimemuvemowixegoguw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af5f72d24---36933674776.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3dc7fe5a---wuzobumujanutukemapagab.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/aa56152be9a5d954d900fcbcd5cfac43/nuwuna.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/rck56lj70ofad19kukhjv6s6p3/42098851044.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a5d1301267593ec385444a7ed6415f55/sixuzuzarafixijunigipu.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/58801374627.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/lokomimolawogod.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7fb5216df6d5c6429bd8f2cc6e464962/taviboxuzesubakewetasuxi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ae1dcdaf---58855801785.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/18807397503.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/loxafazexubuzat.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/42670474956.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9oumsql6844emcq0qud3kn8il2/fetejulokola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adam+and+eve+tree+of+knowledgePDF 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_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10660 bytes
SHA-256: 29ab0f94f0736000dd95c17da1a0709a17714359774b0fa24a79026b62b595c5
font_01_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 17448 bytes
SHA-256: 474876d32f346a853f398124fabf2425392d0d3f60006fa345e99bdc1a5bbf9b
font_02_sfnt_off000151b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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