Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad9da380f6a5bec…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 18:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c39188898a64f4d6e4de83380af4d86d SHA-1: cc7034d4aa23b5c88edaacf4dd6e499bd4d8a479 SHA-256: 5ad9da380f6a5bec8a66ad98fbba1d1f30c77cbda06347c0db27db7c0e69814d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports the attack pattern of using a document to funnel users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/jutexazoviva.pdf In PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/17639745047.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/34488604486.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905053050.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/72531652772.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828724bddc---5568763058.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a79637def---39543783636.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/33861220616.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/waredimutefolulef.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/soremamafuno.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sekenigebitoxig.pdfIn PDF document text
    • http://agama-rc.com/upload/files/4521988571.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4c702fe27a52fdadbf29495d97bd9273/dowabitowulapugowasu.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/migiwuxasugaka.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mupikopufebuvuzodajaz.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/vizadimuzowalaxa.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/14723447390.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fuborubabuwenogudum.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/18734403167.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe3d00d58---wiwiwonajarovipokepirab.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/muxijixitekaf.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/71144317834.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/45961201460.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/61990504844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+wallpaper+androidPDF 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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 17328 bytes
SHA-256: ad4be7e47b209fd00248bd0617d8d02f9648c055638bb866900428993edf8dae
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10456 bytes
SHA-256: 34db613b6d2d2c2ddbf6c5b04e28f7ffed044205b07db92e81312e6396f6c9a9

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