Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca0a2097d59e176…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 21:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31d5ead6625183f6a2ae81265410e038 SHA-1: ae255baed96231d07f08c1c5fe34654abc0ebed1 SHA-256: 9ca0a2097d59e17667188609a774cfd258fe21ffcc5613b7d80d4425a87dd38b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://portableandcool.com/files/files/95916326004.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/88m95soupsas4m7lasi54rsoic/ponevifefitebaxugi.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/16998565620.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/dumemarumesatadimuf.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/suradidazewovavokusemat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qun53uenva0df201dfrc98gda0/97346887943.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/41092051761.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/21723173796.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xexumipe.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/19992441580.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/27599689689.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zalameled.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135772bbe458---58946807373.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b59b2972---sadufi.pdfIn PDF document text
    • http://cloverdiamond.com/file/tigaruvexaroladak.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/86358704708.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/48632795203.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/92904886401.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/nedubovariwanavoxiwowa.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givabotimelifibijujuko.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/57831590803.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nuxuso.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53757428542.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/simalekuzezejixilotosew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=redmi+note+8+pro+qr+code+scannerPDF 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_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 11028 bytes
SHA-256: bb62bed4a992e360c47bd4a0f0504fe86797098a81138eb6c33d86d154ecd92b
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 17532 bytes
SHA-256: 92eddc3cf5cd044644eb30d4b9eaf10405afead5d3adda9851973cc4ef62c43b
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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