Malicious PDF — malware analysis report

Static analysis result for SHA-256 526b3a21f4718a15…

MALICIOUS

PDF

96.2 KB Created: 2021-09-08 03:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c90791c796a64354d0956f28fd795ca4 SHA-1: 18c6023ea051bf7eae5f6db6f9ef5a298f1d4024 SHA-256: 526b3a21f4718a15939fb671b26dd56eef14dd7ac9262bc3fa64b42c6fdbeff9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or link farms. 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 uploads suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://blsautomation.com/ckfinder/userfiles/files/20257705189.pdf In PDF document text
    • https://atputasbaze.lv/images/userfiles/files/zawevebapap.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcb2f26ff9f4a3a43692a8fb16c56e0b/kitewovamorunevi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7vnrr1vu0tk9bt0mn1im01l50j/77815924792.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43dfba161---womenukalogaporoferepem.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e1f6f8bd71eebffa68fad6feae42aee/sasefafuwunamaxisemona.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4b8a76675d9a5088f6e74e2db1d188b7/gubexopufaf.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/mijavidukololag.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6cd8b26d---3400981108.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609248eb394af---povibedutuzij.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/fizil.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1aipdn86qef41g13l4v3pr7gk2/jomalanexizemuwowikimena.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/92924224914.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/4058941436.pdfIn PDF document text
    • http://harlit.com/upfiles/file/galojikilivom.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/bojuzumelejivetuxuxor.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/jajuworixukowumoxarobegil.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2f0385c7f---vamukibunimajazoben.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/60101853008.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/roraginemosanebavopad.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/57555027785.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372105d1239---74771606480.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bagaduxijanepovuxideroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=difficult+airway+algorithm+pdfPDF 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_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 18348 bytes
SHA-256: a7a5bc9e54c3da013b2487762bb8ea0929e2006c07e840b1ca13b428fcce57e7
font_02_sfnt_off00015a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A08 10964 bytes
SHA-256: d66dfe432f88ab48d1569096cfd07a24b2ebfefa80e2fd1875d7fbc5272f9ee6

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