Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc48ba4c94c97459…

MALICIOUS

PDF

97.2 KB Created: 2021-07-23 02:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 79d66b702fb490c9e2b228184084df74 SHA-1: efa3daeb47af1a18bfb36f5e2196990bc26d1244 SHA-256: fc48ba4c94c97459c4d1065ebe3fc16eb993460b9ff6f418e51bcc8edc850e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://binarbaidrealestate.com/public_html/userfiles/file/63615756433.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bc23db98---14221745224.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46f743e87---dafovanufujosanimejugixoj.pdfIn PDF document text
    • http://cartopack.com/Images/file/60814617843.pdfIn PDF document text
    • http://zerosquareonline.com/file/36752025763.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jefijixirewew.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16259090221233.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b954f2d3---talibufazojejakuxuxufo.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/rukodanusog.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b132b015f4d---kavorewenivaledobesir.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/lafovokil.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/om5muoat0o4cmmeo7g095ep5il/30204953388.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a0cnc0coq4cd713010j75huv6/neribuserikudarebo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/39451337273.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fa0d42ac751a82b53ba469fe5bef6337/diwepasogulinadalavagu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kulenolofotukajuwo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/38750033552.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/032cd4cc66f018ddc55457e9cde1dd84/84308367059.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82fc0744e---76309486409.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/012115331b16a179c95340dec2e9ce2c/sovetipodakomitapubawot.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mqtd3sa6je25vsi8tdua801rns/86501948272.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee8432519---riwujevulomo.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/vusugamapuvevoxukozuni.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625883194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+grow+asparagus+fern+from+seedPDF 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_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 17456 bytes
SHA-256: 83d80721c1dbe87e49f33539568ae4296cd9e73877d396a9ecf4c7171a566d0f
font_01_sfnt_off00014560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 10880 bytes
SHA-256: 3dc1a822ab5786dff8b850606b06af3c98f281af5a9c250a05748df315a35958
font_02_sfnt_off00015e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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