Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c9f939be418fe7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 20:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67ff16581ba197e7927e1ddd7ca3a87f SHA-1: 728c31da38d147975f772de548ec4c8b3f01ab72 SHA-256: 20c9f939be418fe77d134b2e885f048e699ed486576cea49b5df1fde9c354367
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results or distribute phishing lures. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://inwebjor.ru/uplcv?utm_term=secret+codes+for+phones PDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b699e8af94b1ab6ab31afdefc7329b51/54613806191.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161368dfa55287---13395052876.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/90679665687.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/63771120228.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109091209375410039n3pk03cla9n.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/44351598535.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/wujefiranamuwikakip.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/46901485806.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/votobed.pdfIn PDF document text
    • http://contelex.it/userfiles/files/44313965644.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/94865997890.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/veneboferiguxuwirazizo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfnoitkd6krtvj48flk2o4rmk6/77124395998.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/duwukanoponewi.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/21288933878.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/telijaturugesujifovunul.pdfIn PDF document text
    • http://stevis.cz/files/file/96899798981.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61091778061.pdfIn PDF document text
    • https://cooperspick.com/files/votosaf.pdfIn PDF document text
    • http://congluc.com/upload/files/22053707215.pdfIn PDF document text
    • http://twilaw.com/files/files/72648226945.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14527300817.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/4740981253.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/39877264073.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6cd2975c---88796496989.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_off0000bb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB85 15360 bytes
SHA-256: e87f8527df5606d812c9d4fc75c2fa4c66515ee86e54ad2303c0761691d6d1b3
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10492 bytes
SHA-256: 1387d5886c499768344bda05fee4a4452e72416254a69e60ba8bc0aa3860b19a
font_02_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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