Malicious PDF — malware analysis report

Static analysis result for SHA-256 3083609fb9c69a9f…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 00:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6e34856d22d9371f4e2c195e82c0eb28 SHA-1: 62df0afa7350f346e475f6b29229ffaca55f3129 SHA-256: 3083609fb9c69a9f37ce2590ab84375754df0daacbca18e9702b6d9508802436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kaushalacademy.org/ckfinder/userfiles/files/46976479948.pdf In PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/92921180951.pdfIn PDF document text
    • http://krupongs.com/images/file/gewewulozidorodofa.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/vilukoraramizuguvafunot.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/xoxijejoxuwa.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/tubisopopabisudejed.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/7263832030.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/zogolojepejagonozowiwujar.pdfIn PDF document text
    • https://maisonforville.be/documents/file/zolepovixujojoweselom.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/kegepafazakomupenavizepa.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6e9099d53b7adb679b12b5b18d9019db/73611384981.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913103052_drdupx.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109180549112155.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56980369310.pdfIn PDF document text
    • http://generoussecurity.com/uploads/4841253125.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092821524373499.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gavaxopizugaxelesirivus.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615a21812aed3---vikuderokovogimiwebef.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gatisisuletoxadumazonep.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/vuwojesosalimuwabem.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/dopudev.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dou7ep07mma1brp386jeleedr3/56250938684.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903222757438.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210928132633_23vsxh.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/75623597617.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/16aj36tar2m4935k8lfrj30tkf/75274113804.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/gewoxapekurowevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=5+weeks+baby+in+wombPDF 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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 18104 bytes
SHA-256: cec6b47e0017a45d8adf7e2b85285aa9c6940edd4634be3f3cb3618384ead95c
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 10496 bytes
SHA-256: 48740ab3e5c78234aeeb6fecd5245ad829fb0c47c1a9340851dd42b3476fe42a