Malicious PDF — malware analysis report

Static analysis result for SHA-256 121009d70f3f3c40…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 17:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7413901304edbf4930d52bfba4c0d4d SHA-1: d0ed7ed984733df8beb8bd9639286f68ed03cd66 SHA-256: 121009d70f3f3c409ffeb94b1e0bee75224f1d8b40a2b932a04db87570766ee9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ty-int.com/files/files/16546249367.pdf In PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/pisakimedofoxosizukefad.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/31739539868.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/21020032001.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902190301605342.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/xodotibomodowogugigikokof.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/gatakozaf.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/luribusesizisaseden.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/31bace7fb56972ce509cabe2ccc87945/10722575429.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/48507780447.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/zejukofebovile.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jebijimem.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vozovufuxibugak.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lufodub.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210910_203517_4758.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c838a2dd---gavefimutivazabomela.pdfIn PDF document text
    • https://protum.se/file/97245973589.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/93714339749.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/21126782723.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030110451050.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/67142371451.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/rinupowezafivus.pdfIn PDF document text
    • http://headrepublic.pl/images/files/64284425052.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/53228737851.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3b51cef8---juravipilov.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/84912737784.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/mepurufeterixexukefawezan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+android+youtube+music+downloaderPDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 11024 bytes
SHA-256: 29da4f5432d94a24c39eab20e13a4f9015077be5b14f8ca347b2d1d7e0a733a2
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 18676 bytes
SHA-256: df5bf00d9c6c9d30767b512cb3e06f1742541b0a66cd5c225485690036f258b0
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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