Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd35c7cbaf7513e7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 14:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b090edc98dce192e5fec1c693894f5d SHA-1: 902b9c0d5d3ccfb511f34e60192748c06f6c2181 SHA-256: dd35c7cbaf7513e7b58b75b09d4ebd7c9649bdaceded2315d4baf3c4348b7d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains. These links likely serve as redirects to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://flardochform.se/userfiles/file/2561761924.pdf In PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/nogisubilo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3948fe5c26---12500996179.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/pemapolo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7452061131---81508652615.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/magimizujal.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8520953e41---xonujulorobugazim.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609982d957925---70048197219.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/91327178987.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/94160507353.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vufupakubu.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/zigakumubalomumorujo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/jupatazidetusuxuzudi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e9da54cfc6f1a71d30c56b6e1dec5e6/68609021708.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/38099156347.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/43397516624.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c441403f2---xaviz.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/45580565671.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosixiduju.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062916495370554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shrink+to+fit+pdfPDF 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_off0000bc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 10252 bytes
SHA-256: 570edd48400140062fa3ff415b3f852e0a1a407295e7f468ca924a7bf5db9a47
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 19336 bytes
SHA-256: 38d409ca70dd26eb0df1056470cb1d2096f26c06c083ea34c2caa858644cb676
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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