Malicious PDF — malware analysis report

Static analysis result for SHA-256 805aa3670e3cbb3a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 02:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da0b0797a1c40d413417b048e8b42727 SHA-1: ba33feeb200952cee88692344f166601e26cafa3 SHA-256: 805aa3670e3cbb3a3a9a4b2eca60636f60ba4420e450be60a38502e3887804fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcadb26e39---nosukosasadi.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///80793184575.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zebizavuwuvel.pdfIn PDF document text
    • https://lesura.net/userfiles/file/97491313589.pdfIn PDF document text
    • https://mvservice.it/file/34160770032.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4388d6f5936875752e2865599ad2ea4/mufevekisewoj.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609790985b5fc---kenafilegoriditi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/uua4s5ji1fgc1pkrev3civuts2/vudulaj.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/kefijulasatamubexew.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c4fc9764a767c208167d5b7ebd5266d/sajokatil.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607573cfefcef---datikilabumi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/nidana.pdfIn PDF document text
    • https://avenue102.com/uploads/file/70721942511.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6001a1973fcf25a4df6fecebb2d09592/82831626746.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/19120698238.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/31114806247.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/gudipenaregigev.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/48906686311.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/37635967797.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efeccab0de---kanitazaz.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210810102323.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1210b9b7e---vujilis.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/287978a9040ef4bc2bddf03dc0632c54/paxekogenemivipovegekozu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1af91994---lupinobiseruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sesotho+poetry+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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10380 bytes
SHA-256: ed2620557d74b1ab77ad4f7ef3a395d126ac769e43faa98a8dc6f4fc6aeb451d
font_01_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 19268 bytes
SHA-256: 8061176e70bef020f72158a3a5f0d771c5294cb9b0d63867c41387938146a555
font_02_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1