Malicious PDF — malware analysis report

Static analysis result for SHA-256 946c70002bebb8c3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 19:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43e3c7de95c461274a9216f883c1dc85 SHA-1: 7af63348e0ab7bd5a6843dbf525ccb46168ed18d SHA-256: 946c70002bebb8c33b2b9a4130dca359ffc0e5cb704f3ebc5e57eea2cc7dd637
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://phannhan.vn/files/usersfiles/files/66745609996.pdf In PDF document text
    • https://rajatotogroup3.com/contents/files/lexanusone.pdfIn PDF document text
    • https://guijek.com/userfiles/file/99018978952.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b782150fb---94152194991.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389034b6cb---kunusonifapem.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/nifikuboluziperup.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/33276378386.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vizowesidafaxaja.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b043352d15db75810d973c18e7b262d5/81355382820.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/40205077306.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/9266302371.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020018245637.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/tedujebaneludugano.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/18065231378.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/pugokurapavatatonewu.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/tunanobubenepinibuwekotix.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/diwoteragoro.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kemegowolakedikafoti.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • http://hanauhrova.cz/files/49777211017.pdfIn PDF document text
    • http://iknow.pl/files/file/97963711027.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/mulojivelomegevefewa.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/87733200354.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/21539596141.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/bejojatutunajexowokasiduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+house+arrest+of+us+full+episode+1PDF 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 16148 bytes
SHA-256: 025371d8debd5092228e67f3f6068a89b5b4df473463e7e547189348da6e498b
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10604 bytes
SHA-256: f6ba0db6fffad5912cb440908ed540079ebbcf7ed611fe881718476b9e832619
font_02_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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