Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c7645747e799d6…

MALICIOUS

PDF

121.8 KB Created: 2021-07-02 04:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fdf4cbb4a41df61977bbbfbc0789173 SHA-1: 436e7a219e6f58829144c73d982df4d2a89d3010 SHA-256: e9c7645747e799d6d3a66e9ebbc6ae5ee933cfd643db25b688d6655af9846a76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is a common tactic to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://boxerdapolenta.com/cmsimple/images/file/92241577407.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4726ed565701d43e306441d02f4c3c3d/rinonosetajavo.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/76386060436.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/08910307a4b43a74c002c6396fee44c4/dojulevabuw.pdfIn PDF document text
    • https://2acontractor.it/images/file/lubukowemuj.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607561417f780---rigafifesa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8d27a0aac---19386841616.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160add2fbb573b---75837471881.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/993656adc3c74048c408ea1caf7b21e8/jozekirexujadifakokik.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/200273336860ddc6d636b2a.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a25715a204a929ef05b831ea3bf7dea/bokajozoxu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msfllsouomlbmsp4kmu2g9r10d/xizegigiruxevumuje.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607934b3c8b08---85400146751.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bd9209e8---43702086240.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cf170a13b80a4da18d49eea9e0856eda/rowebipogitez.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/haq7lism84ar1tjp9ru219t50s/35328546661.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/561b9cd60ed23b9b5b3beca4206d04e1/4683305216.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602205038.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mdu3he17o4b74t534asd46a925/dotelugiwon.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f230047f---tuwerod.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2af68d9de---vujizesopiwebid.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a41a9f122---88019722666.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/parin.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6ldekgbb3to6pianjq2p8orfit/99537841619.pdfIn PDF document text
    • http://stasta.com/userfiles/file/tagujumu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/23oihaf2bjq6ef6f3r37j4jkj1/52331423024.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2602f0a6e7febf5e6b2312fb288a08e9/pepipuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=age+and+ageismPDF 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_off00017b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3F 18260 bytes
SHA-256: 639a970dd7d0de33c603b85526f932f177b3aa842d7e51b316bbcbf1b185150b
font_01_sfnt_off0001ab4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C362 10208 bytes
SHA-256: 0299af3524fd4ee4314e69a0cdd082c3bc13ea2ce90f19f53bf9d85382447487

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