Malicious PDF — malware analysis report

Static analysis result for SHA-256 145a9c7fdc7da555…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 21:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 752b0b0fd577f4041436c1ed417543a0 SHA-1: e150b5c516c32bbe645ee4eaf1d4e9cd201c2a76 SHA-256: 145a9c7fdc7da5550fc374d9b938050a5e0cdd51efa20c9be7fec579adb7bfc8
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it's part of a phishing or scam campaign. The 'Fake CAPTCHA' heuristic indicates the document aims to deceive the user into performing an action, likely to download or execute a secondary payload. The embedded JavaScript is likely responsible for initiating the malicious chain of events.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://synerhu.ru/uplcv?utm_term=hushsms+apk+frp PDF link annotation
    • http://pitin-akutsu.com/js/upload/files/kulineralukajadix.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/99372037512.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef50d1b9ba---54736911753.pdfIn PDF document text
    • https://nexapos.com/upload/files/xorujibozuki.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/39257824148.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/xatuvogeluvanilej.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/tolekuwugudas.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdff8a1ad8---jobarasumesis.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/5932711256.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21158901561.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/78181346762.pdfIn PDF document text
    • http://www.puskinas.lt/ckfinder/userfiles/files/48443602479.pdfIn PDF document text
    • https://dhesient.com/media/15640553360.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/lobanawawodog.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/popatujofixujakixota.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161368e62b9bef---69790420428.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ce36ba6dabda630ab9e11cc604c0275b/gixafidadofexezuvepaw.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/sabopego.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jiwutelebutef.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/mevodekevupawik.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/foraxemigupelomed.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/bosamekuwenerobop.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/pazojezileninupazo.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/6862233254.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10216 bytes
SHA-256: f6734cbdc0104b586d749ee6d43578a59eab660ef2403d9125b1c309fed9981d
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 17144 bytes
SHA-256: c9ce4c457ee29ffb3f0a5bf7246f027e461b51db9f265fce7ca30af0b10037b1

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