Malicious PDF — malware analysis report

Static analysis result for SHA-256 3126dd98513f546a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 17:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76112b74e613776c452badf136914001 SHA-1: 7d68e8610dfafc52f8f360c729d03b071a61cdd0 SHA-256: 3126dd98513f546ae4e7ff3d2d03894f201806f2a2300be9c58d1046522f54f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=big+little+farmer+unlimited+money+and+gems PDF link annotation
    • http://maezawa-jidousha.com/js/upload/files/2077194084.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/depijupeleve.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/92324341294.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/meniwowenevakajofi.pdfIn PDF document text
    • http://4yoga.by/pics/files/kuxuvaxodilu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614214fbcedbf---zelagukamipuxasuzotusodig.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gowumuleneduwe.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/pozupopaxilazurokibelepo.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/suwamaxifeveb.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161424e12b46a3---milat.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/menomiwoba.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/49652172549.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/80e0450f3f5f27cb43debb12538ce409/bemazapexika.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109191055233732.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/rovotevavotaxalawe.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gesewenisi.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/61254893574.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/79081440957.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/povikiremejonus.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/59224683946.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/42148471863.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/fasejepatevixubaget.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/xuvepowuvemifil.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/kujalibivazaripu.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/ramisefanupewafafig.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_off0000b453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 17248 bytes
SHA-256: 28aa83543a379e60d109716ccf5fc60f0e29018734acab8da9dea91163570425
font_01_sfnt_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 10964 bytes
SHA-256: a503d1def867c07640a7f8d381ab2c77a1959740be200e15cdc15e2aab0c4e59

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