Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2553d012f9efcaa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 07:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 229ff0e35ad7f1b3687348ad090dbde9 SHA-1: 8c54054d4f623411bb740c87e59a79764ece6792 SHA-256: c2553d012f9efcaab52a1ae10047fb4411bb7d6e7228c297d7acb41bc0c612b6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are changes to payment or banking instructions, a tactic often used in business email compromise schemes. The presence of numerous links to PDFs hosted on potentially compromised or disposable domains further supports this malicious intent, indicating a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2741267919.pdf In PDF document text
    • http://retroldn.com/userfiles/file/46096130271.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/baxazodoxotax.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/muwejokawupinikepigixi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/57571911921.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210918014303.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091205091168.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/milebelilovopi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ed3986e5685cfeb4f2d2db1d9abbec2/dokukagipiwasa.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/luzulitogizuvokixazijo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6c556a73---22301802111.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/mogukimemekinizivinar.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/foxawoginirivugibuxape.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/50797554256.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/litorejogoratem.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134bca7ae87c---47697785941.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23833914199.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/34044017219.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78104848327.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xoketakiloraleboruduxegax.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/90135849039.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1e244a1ec3b43ccdcaee0425e7b15350/jipebunelefisexuvowusoz.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/54552631956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cara+memindahkan+data+dari+android+ke+androidPDF 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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 16744 bytes
SHA-256: 9ddf6cf14ff6224652021e23c9d55b012a97674168ed515e79478a131793e08c
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 10424 bytes
SHA-256: 003701aaf84cc60dbcb92b0bd0aaa43839d8d47dae6dbdb21a7a8d8a9ed679a4

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