Malicious PDF — malware analysis report

Static analysis result for SHA-256 3907b754fcaa7970…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 17:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9baf94af5d45f13be0d26b8b68d6e384 SHA-1: e4693c3eb1180189f724be34f3eb472a4129a53a SHA-256: 3907b754fcaa79702d19dd987f2c7ad1ee519694cfa83b1deec0ff26e096270b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of these links suggests an intent to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=how+to+get+100+robux+for+free+2020 PDF link annotation
    • http://akvari-um.ru/userfiles/file/83814742334.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vikepowetinuzimalinad.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145221f0c83d---nikodag.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf681f51a---75437642632.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210916025550.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/84hqf00g5oo2mscetq1jgjqrkc/fefoxiv.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7e2ed6fd---jamututepodatemev.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xukususuxuganajam.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11561092239.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/5401487567.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/20380119922.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xufobaw.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/5164606155.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/nosexixej.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/84363890102.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/76621731873.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/pexonexedizanulidexowa.pdfIn PDF document text
    • http://didopack.com/files/gulamifirimujesamefil.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210910194638.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146455cafb62---runadatukuvaditetore.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/vanojasefokumofug.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/mutidevowad.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/22002222725.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/68882184160.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/85795640769.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/xesap.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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 21048 bytes
SHA-256: 52f3649b367e5fa78ea9c7a0635b90356f5dce1f18781ffb901eb32ba461e95e
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10532 bytes
SHA-256: 83e09e1bbe1dae353cc59c1e2d12e0a36fa49d1d4746734a288a1ce389e10aac
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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