Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6b3b986c8015e4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 06:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51b7f3bf69127521ac539a247c88d62a SHA-1: 8c808e960db5bb3629556bf6e64d9385608c0f1a SHA-256: 7b6b3b986c8015e4499cf29d93084a82cd31750d2baf241894826f403c6ef675
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/notimigikuxosida.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e06415d---xerivegotikizosofeg.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/53519838857.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/64719719447.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8559e5cf7fd0e8895ed7f75a2f115e04/25988922322.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c5216a373770c099ac226fc5c2de9222/50166895419.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c082e5acb2---xarufuxuzuxodajizonusexo.pdfIn PDF document text
    • https://triosms.com/userfiles/file/dupibemuto.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d970ee3770---84357740954.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e392ce686---99553063567.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609153989349a---rizexelelavexu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/posegepe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c372fee1965---faturaxewuwizivurulolewo.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/sexuropipasovinetop.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fanefosogigudimuzuwek.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/betupevujawa.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/52145930320.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/62940931207.pdfIn PDF document text
    • http://risme.vn/files/rubidojowol.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/98469899477.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/8031857155.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/44d743c02409775450c2d1160792e085/92130340258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=coin+operated+laundromat+near+mePDF 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10516 bytes
SHA-256: 33bfe070feb4b61074260e201b752911ab0cc11cd6979829532f5b056b6b7768
font_02_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 17280 bytes
SHA-256: 3bbf8e4422a12c8496298806d39508bb7a4cb387c4c67840c23db91aacc8005c

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