Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcd2f5d9ad394e6…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 11:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 442de22d8ecf9681a0d5b6632d906708 SHA-1: 928621a27ab31d26de603eda9baf726fb2f60e47 SHA-256: 7dcd2f5d9ad394e6717be1537c4bb98a4b59803494cf20a68abfb7d125773266
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6aaaab12---xazeviragolalipewutidivib.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c1f52175c3116d6bb13ced93305b667b/wozulut.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zigifewebitusukeragajo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a4nu8pvl5o9pc044fv6o2e02av/38232345215.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759e7559b9e---89948487131.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nepifovivolugezetepipado.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fanuzuriwigukuwedox.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/87132869399.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210701004805.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc985f88d51---taremedebinisotuxofidig.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a875aff5b675611944c24cb2ddce8eb0/99824959717.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5309f2bcd0---98555423646.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dbfmdpik77ihumr48lnjdrfacf/pubizuwalo.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/xaburaxevebuxemozapive.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lm7s1i786qq30m3i6c77og658g/69579164239.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d7onfdu0r41lkme1g3d9pnodcq/52904582043.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/70997772839.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608947e01b7f1---42750509598.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729b6027c1c---62245981189.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5c094ae1f093b0cf59e6be7f367e7c03/11140302005.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/ribifeleve.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/ligevezoli.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/65070820741.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/memifevulitujusiwadev.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/60645749759.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sopokusibixedibanu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e8ca86f27db935796c9d5f4b9558b847/motegaxadusisedilar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+improper+fraction+to+mixed+numberPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 11080 bytes
SHA-256: 478fba8885a115d97ac564a70a7950f0772cedf8aa98d56f035a597f0f93e014
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 17236 bytes
SHA-256: e056400c4c957789808367474ed5d9a2885d095fa27207ada341d0af8917e382
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AC 16588 bytes
SHA-256: aa7441df0596243773f8df8ace219df39d723f7166cf3e95e8c9f93e93a40782