Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89ceb2a98db620b…

MALICIOUS

PDF

80.4 KB Created: 2021-07-26 12:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c968f2958fa25b76b59fdcbd8c719abd SHA-1: 57636a47a617a90be24fca8fcf5db35c2c4cbe29 SHA-256: b89ceb2a98db620b9c7f56e73b2b3d08fd9c97e4fff2975ab7950437e8e54e94
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these compromised hosts. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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 https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e21cad2b6---vupalulogufitukapi.pdf In PDF document text
    • http://e-cluny.cz/UserFiles/file/jajikefalexowujexetuguduz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074368c08a3e---91231811008.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/74541113489.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//15192395938.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fmds40665id8n2jl1kr9p7d9b7/rodedugizematelabeput.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18b8ecfbbe---78993369797.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6efllvtr1h3omdjqms03d9ds3/momid.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/gapekin.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83c31316e---xumubezigazap.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/kobokunujebuwiv.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/zumidit.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/lilusime.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jupadubujod.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f3bda9003407d86686d230f0dfaf4756/jimaxujivovigotudevuso.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/95139407950.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/resukiduxoxo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a3ada28783ffd2505c927324c4a7dad2/sisikaposaketixaga.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210614_727512BA8C7F8EF2.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/sadore.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b5cbb894f8230da0d091ee48b3b3a9df/42514975773.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/94587924745.pdfIn PDF document text
    • https://puppometalli.eu/file/dudegomejitibinaperufin.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/53601733343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=moviesda+2019+movies+download+tamilPDF link annotation
    • 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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17160 bytes
SHA-256: 1eb91833c466bb3ce59547f01f37a22238d04e8ce1ca3c5e88b695bfbc031c1b
font_01_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 10916 bytes
SHA-256: 5cd3dda1e1c6e5a4338da4972f5116c819d2fae5928d524b8c0904cffb764aef