Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0f01df1491e26e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 20:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d7ada3fde7942f481f0fefb5daca0ad SHA-1: ac81606efa052856377cac14c7dcb40fd2105350 SHA-256: 9a0f01df1491e26e75085b4ed964f9609ef7d07c2f6c9c5ec6395db7c797ec2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/iqvp8101h7jq3ij7jebpdo1inv/99491770685.pdf In PDF document text
    • http://standdominica.org/files/files/40452849979.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/37969274636.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dixopabapigovef.pdfIn PDF document text
    • https://luminex.pl/upload/file/zozinifesinogegi.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/93878173924.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/86498490474.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bokuraniseludabal.pdfIn PDF document text
    • https://coil.hk/upload/files/suzedikidakujupeti.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduneropidixerejojejabe.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/45922808603.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1cf79f1a---ronunezazevuz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134077a7396e---65488552786.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/jenuxasu.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/19687192588.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acee8b462c---vefafamezuw.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i1vm1h28hfipbbifsoufc28klm/ximusupewamudodawe.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kigupobewidafisag.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/50629812230.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b698c21525---deketoru.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/79537168581.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/916dec21b0b4a543b1e30c21c6970aeb/75804445740.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/660427329613a0894ec522.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/36784152985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cartoon+animator+4+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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10172 bytes
SHA-256: ac53f0c25e288393efc7a3c8198c7c47404c17f14d1497add69ed921ec00e014
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 19188 bytes
SHA-256: f82a0571adcaad87026fcebba3710635b18a4f857a9955f7b805a86353c47a4e
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1