Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8cc07ee460c5ed…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 12:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91976095f2dd31d9bf95adc72c5f4680 SHA-1: bce5691fc8ffe6a8a0e68aab02972073e5e5e631 SHA-256: cf8cc07ee460c5ed48d2ef11a5ee9c644ebc1b4c929d1d70efc23575e66e21c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a fake CAPTCHA lure, designed to trick the user into clicking malicious links. Multiple URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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://ruihuitax.com/files/file/vamenadomukezibola.pdf In PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/18336137813.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/59544926019.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p3mn2o1jvmu3t71tmchqdi67d6/31000798109.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e90905e35b7e24c1d75712d0d316a687/gatadusosanudipagivofaved.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vuxonomugevuvor.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/92222384182.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/27080896230.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fhqa50kf7glmqvnqa5vn46qu48/xazobedaxopasixuvinavok.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/3525353794.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/75cd0c3e181555fdc1690d04854a63a0/xuwororagedexiwagejedavi.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/99348655602.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/fa1197b181d5aa64b7a67427024815b3/gufegenavijemituvedupe.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nenoxibitatesiname.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/kofesapimumal.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e1d7414b---xepalukewazevevepot.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/jesimuwagesus.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d1838ba46eb395e3324de499542e2525/15801638004.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/mebujojiviregovajamo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/rijipeteguzukuniwelav.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/12635640691.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/325905bd2939b5e0d4dd20d27fecd551/27643646667.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4a1688a7---69746808166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tracing+worksheet+alphabetPDF 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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10932 bytes
SHA-256: 2f2ceb69656ca941be3cea81e172433dd40b7a020129f7c351dcb861b1565e15
font_02_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 17964 bytes
SHA-256: ece476511cb0e408ce8ecffb7b533473ca23d93a7527c80cf6b862bd7245af08

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