Malicious PDF — malware analysis report

Static analysis result for SHA-256 c276ff7e8f338d07…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 10:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a8a1b6d368b363c03a010986363d5bf SHA-1: 7f03c581f39d13f8e65989618631d5706b513309 SHA-256: c276ff7e8f338d07fe3e69dc5e7e66d2ce5c2710f787f57263b432c25f2b48f7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=2011+ford+escape+owners+manual+free PDF link annotation
    • http://tlumacz-lipno.pl/pdrzewiecki/files/fobed.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/kuxekogiwolutafuket.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/juzafinobono.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084176c93b5f---76968856183.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9324eb2ae350bff5a09dde50ec2e96de/51115575015.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/sudekotuvovibemikisus.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/efdd82b66c9553fa427de98e0e6b5680/nedasu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93016590625.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1cggpl6nlnafsbhmlonojejr0p/80985432346.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135cce65cc19---fumexisenuvisizitimelelow.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26185256a9---xuvetopilerowixofatubixo.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/zataleveje.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/209fb82f3be52d4d95f5450f7b14e45b/xesijabegitoner.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e28905eb744---34928019450.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/gufevotubudufug.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b56407c8---zifokomovorer.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/57242772811.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bigubugogirofivapofu.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/34548711105.pdfIn PDF document text
    • https://nexusmediation.nl/files/monapolomen.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/051c7bcd44d3c03767e9ebf956d5fd6f/pabukezutodizuvo.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/78773708581.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/4232741780.pdfIn 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://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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 16784 bytes
SHA-256: 0284be05006f8aa898798c6124ab0a3e0dfec552917ca61b896b8cc461c3840f
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10972 bytes
SHA-256: 9043547b6c20d270628037a081ff2ad4825576e321d0c2045caa696572720a22

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