Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823e21130b5d993…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 08:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd4d79e5ba3bca2f934532a1cbe69ab6 SHA-1: 4437399f87aa5064cdbdc5f05da31a312e28bf33 SHA-256: c823e21130b5d993da804c70158fae3e34aeb3f7b93a8591e0f625dddd3d60bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and is identified as a phishing lure. The heuristics indicate it uses an image-only design with an action trigger, typical of a screenshot lure designed to trick users into clicking a malicious link. The embedded JavaScript likely facilitates the redirection or download of a secondary payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=fire+hd+10+2019+android+version PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7n0732p942m43oursoqj9n7db6/18946994150.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/88673316274.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/rivofefeninivakubi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/4185083166.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210904_E4D59EFEE6F8EE2B.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210904173038_pdinvk.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/momopel.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/35294a6929ea0f250677584ed8d6ea54/28073277808.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/suritejijasudofowalane.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/26869581815.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/zukapuro.pdfIn PDF document text
    • https://ghnservizi.com/file/71051397956.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210926_E86746E7C128E2F5.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/kirizikibesemefe.pdfIn PDF document text
    • https://kpii3yaw3-7nc.com/contents/files/13057828107.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/supotuwezajasugifuxerebid.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/94323491842.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/pevawago.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pexudawimozil.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/483fc6af83146ea85f7a0ac4f3206426/64591728951.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/tepawuwumelesurimef.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/lizedab.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_off0000ac6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 10704 bytes
SHA-256: 14fce8ba9940ad07f6a9509350effc9aadcc4af4bd51d051b0fb3fffc23a66ab
font_02_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 14396 bytes
SHA-256: a1513f1e5a132de7bf46a9550702599710c6a4a38660b8900206a9cb471125b6

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