Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a511aad546c1f76…

MALICIOUS

PDF

85.8 KB Created: 2021-08-31 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7714540f2c013d2f045c99dd34433ab SHA-1: 3f5b1c21e59134cdac8e4049a38fa77295755e26 SHA-256: 0a511aad546c1f7684b82f5e28e7bb0cad9eb498e9263ede9b7f1c481fb064e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS platforms. The primary attack pattern involves luring users to these sites, likely for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/80035510948.pdf In PDF document text
    • http://93564497.com/userfiles/pibiluberupuwi.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/44059308577.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/70686236687.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d734f334041---bolil.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/51273728926.pdfIn PDF document text
    • https://agatanorek.com/files/file/97678818156.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cch12m3hq5smerpncvk6p951r7/70340319000.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf64160c1---fukat.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/77bfec56e0613fb2a030e456ffba1ba7/77193298101.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bapurusix.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/39834153606.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zofilagimubenatel.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/gerifonuwof.pdfIn PDF document text
    • https://noddy.nu/images/file/19636710393.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/jowimimararoxuwa.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jezuvu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/df3a8d9c87f013c77464cbbaae2c589d/zinupivanat.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1af68651---93025835782.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/zaruvepuvidofo.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/df85ce7e4c28f006301c4f49a4b89851/wozudevalapobetiv.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/soxofozukusepufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=female+dog+has+white+discharge+after+heatPDF 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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 17236 bytes
SHA-256: cdc095fc115d2e85776b020549cb89903955c5cdf3690daeffd41e1d4e9c671f
font_01_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE7 10884 bytes
SHA-256: 996a6de1ac0c6d1324830310f42ebc771ca11a1dfa9581eaf12a63e6d0e0b7d2

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