Malicious PDF — malware analysis report

Static analysis result for SHA-256 202c8da6785a78ac…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 23:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c01466a5745e0b219360f4f50d0f4dc SHA-1: 0e63daba10cda2b0c96a18f255ebeb94b7dfada7 SHA-256: 202c8da6785a78ac9b57890fb894aa5aa4fe9c7be44e1ad02946382f2c18252f
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often seen in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://ugrctrani.it/userfiles/files/fadakovalafinatazexirus.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/refesalisuwapemov.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/43555398790.pdfIn PDF document text
    • https://ienter.bg/files/99846052168.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/balajuvi.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/59249126883.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/mewasowuvewotigetemosur.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161009654afe30---vidutelujeze.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/18055189549.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e53e2439a---lipapusof.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lazujovopozigajidivaximex.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/69885531069.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3a47mkahguf9o1ea4esqtp6ej/tanujusukabaroniwuxines.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72634dc09---81564371116.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/lomix.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c19ce76696---8389070693.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c7828f4a7---18280432880.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kmga019pokc3115jb9q9ga2c0i/sagojexaz.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5dfc70a7---7919698181.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/joguwamejubewuviwipat.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/88869643655.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/66756509071.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ee3e77817524432ec7b2b25ed8e63d13/426272060.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/73209920767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aice+thinking+skills+paper+1+answersPDF 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://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_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 17740 bytes
SHA-256: 6c00f830a075c48742db7782939d6cc5a6be9c32f9b66d597f17e27c70547ea5
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10744 bytes
SHA-256: c1982b251f2782bc58b13d022ef0865ca1e0d403ae8f36b35c66817f10fd8716

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