Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a0c7f8e3b6e48b…

MALICIOUS

PDF

126.4 KB Created: 2021-06-12 03:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6342305e05d3c5ac5cc48a89bdb3a16c SHA-1: 95f44c95bf8124c0c9c5f1eb45916c5e74e93f39 SHA-256: 92a0c7f8e3b6e48bd63e03aaa01cf88c26638e56617b909cd0db93be2a6b41bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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 https://catamma.ru/uplcv?utm_term=the+legend+of+zelda+a+link+to+the+past+gba+cheats PDF link annotation
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8b12d33126d327ba1e5f1cd8f95b7547/69461433865.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd2929442e5ab5c0c8c7c9b52f6f6ca2/11918637065.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/43bd73164317959d5a67be1c9cac7a8d/51846233224.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/048a219f0ec3413c351eb66213151e4d/19897439626.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c418e64a0---gaxitarasijowowipakefisen.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gijuzomusewotuxozuvulir.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ef7e9f7b78adf401dafb856b131b7e30/83903992667.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4h19bduhjkgdk5pbpsteoe5762/nafuvuno.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e945b788f---84578872468.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607636133c974---88429610139.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608248e6d0f2e---javusopovekigege.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52552830603.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce6eddfb---42788501389.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/75135709227.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0dd3788822370c7f6324f1f96959c6c0/1935318079.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/jefimifegepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001556e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556E 24608 bytes
SHA-256: 87c3c7ff5bed56d790f333b6837174ea166e0a70a7402cbfb2d819fdb07e7582
font_01_sfnt_off0001a378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A378 5312 bytes
SHA-256: 98ab57716e91d0b1a993bcc6437e72386f224ff5455e9e2d48918854daad841c
font_02_sfnt_off0001b586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B586 12068 bytes
SHA-256: a4cd196a6757bd64add9f77f2e07f381051b4a128ea1f29bad213c88f0211132
font_03_sfnt_off0001ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDAA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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