Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c04fe3afbe2811…

MALICIOUS

PDF

66.5 KB Created: 2021-09-04 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 874e20613874a3e393be55ae8bada13e SHA-1: 1335ae7e7c3335a1cc2c61a94678cf801978aad4 SHA-256: a0c04fe3afbe2811e3a2afdc18d18ffd91e3f3c83a3413f3cfe9ce32eb2ec832
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

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://krisoc.ru/uplcv?utm_term=here+i+am+lord+lead+sheet+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54e37158d---bebawukexajolukav.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bb6443aae842d467f5eabc985a5a2f53/56951415159.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e240a2390090c0c4e9c48387b2ef61b2/9611163049.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7bd2aa7031f72a028045507afd5e1f2f/69348481772.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3ge4nscliu6q3jrc2h1gvn3ont/49820119760.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/konizibudaxu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/77423588584.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1e29c962f---4003673520.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ddd90703---vuxin.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/8d77ch7g81sco53ghui5dt96av/jitujuxutanijetawinizew.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/gipalope.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4505bc08cf85cf0b1d1dcf2b4061770c/vupilagigimelev.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/muserobosugopodibo.pdfIn PDF document text
    • http://www.centralperdana.com/file/4006887323.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/41371918292.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160cffdbce9aeb---fajojilewaxapibil.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607656faf27da---jesejexavafijoxopamu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6166ea04---10820053991.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sojusu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/094f5a1330605a8d95d44dbd2ea24af5/7938274250.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/17435745674.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8bc2e5412---xufixufefaj.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/98224253757.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/biketerabibudogumi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2r35herg826cq20it477f1g392/gatawuz.pdfIn PDF document text
    • 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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16392 bytes
SHA-256: 5f9d2155b904d35970bd7e56a45d30f72ae9089886ac2d8f42916af6a734e1c8