Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb02615cd823b4c…

MALICIOUS

PDF

97.3 KB Created: 2021-09-16 09:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1926326b9b1fb6f133d2da97e8e697f4 SHA-1: 2576824dfa9634f6035d61b378469f54c25676a9 SHA-256: 3eb02615cd823b4c9e5289811b5bcae468115401b1a35e70b5fabc7b9ed65618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment. No scripts were extracted, but the structure indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://haokunchem.cn/upload/files/wugedo.pdf In PDF document text
    • http://superazs.ru/images/news/file/6605404041.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/xikopokuxirosozajuwu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15db11bab---narolofusolajekewuvukafa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613120536c3c4---ninexirajamonitivozubevel.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lurujugisudajegixanogil.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa782a035c---18353903859.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/94112657645.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210904_465197C517F1C0CC.pdfIn PDF document text
    • http://sial.pl/galeria/file/61691393761.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/tusagexapikosej.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161323237ae3d6---sakosiberogazaxesejefoke.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/raduraxozepogisusenosimar.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pezulax.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210911235245.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/38910988504.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/mupepotolijovabiz.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e6f1365bff5c06550b2577570ac11ebe/rafopowogenunalawa.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tuvamurudimebuvapefesux.pdfIn PDF document text
    • http://sunway.me/uploads/file/140341243308.pdfIn PDF document text
    • http://headrepublic.pl/images/files/59645995902.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lipiwosemugax.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/45094445111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=me+before+you+online+123moviesPDF 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_off000111ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FF 19880 bytes
SHA-256: a216edbb022dbe852aea02db8113e54dc0f2412a06531eb6cf720fe767fc95e7
font_01_sfnt_off0001468d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA4 10872 bytes
SHA-256: 8c830b789c9fc9662ab70665fdd89a0d0f1994a4d9998a21ca7c8fa076c5e27f

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