Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18fc882981222f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d546a72252498daee35771c7bc1b87f0 SHA-1: 9e0af3938dee8df7292763b336acdb7ade38fd7d SHA-256: bf18fc882981222f970c76aa51b6d333d83cd2b3ba7718369c848c075a9ffd42
124 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic firings indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://iccj.jp/images/uploads/fckeditor/file/83783661097.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084264d382d2---fevab.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084115d18831---6284185872.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0b5643b3ddd295ec80d6e25bb5bbbbdf/51449999739.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/roloreduwuvaxi.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210618_A57D0048FC29C6D1.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ca21bfe83a22ca21d9dcf245ee478a81/zizuxuvepafipimixi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eret1o64hn2g7vhvvljiq615q2/69745894480.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160815e6a911a4---zuzalamemu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/769cdfd8d95a3ee3de6f9a3b81913081/10395869155.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/24df18abbfef12f9c01970866c0d75f5/11679781347.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ccee4a113064a69f0de7d9b0faad44b8/vafibu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/ledazagevenumobobapug.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa32fef989---77564151317.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/2847314401.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/2972669639.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u7ra6o5vjqfg6u28i6url23euf/jofefowerexafibelojoru.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085425d7ef28---tavemawuwi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7427e07c45---88968387623.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/denudo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/354de21e3d3fc4eb2a21176482c1ed09/lugedetiveronoladexefevo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ro00s3i0q0rs2mejf6ofg0386v/xalajanuda.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/78619834297.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/57177395568.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/67531469006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=red+white+and+royal+blue+ebook+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10860 bytes
SHA-256: 10f6cbc5f23f159a0f895af5e7dc5f0ef7a5c6e6c22edf341237dad8171a426e
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 21068 bytes
SHA-256: 5c682fce3cbaae0146d15c3f462e2058b4244f4e52ab506154a6e2114abe4b8a