Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0c1bb368994ad2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 18:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c0c66bc85b14d4ca801d0f29f34d5e5 SHA-1: bf9b66ebfb31286c96919cee03f9947a0fcdfb3a SHA-256: 5b0c1bb368994ad234846fddaa5d68953c3724c2dff4facd5746ad0db1d30036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=android+auto+lock+not+working PDF link annotation
    • https://cornwallstaffagency.com/userfiles/file/76773098680.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/49319981705.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/36988781002.pdfIn PDF document text
    • http://zenkatsu.dk/files/22381254395.pdfIn PDF document text
    • https://mimpishio.com/contents/files/fevemikepusimuduvu.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901065510273290.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/ronanifas.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/bekukorebekavasinane.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/25117624510.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/64004983340.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60087388547.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/20777863222.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21158901561.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/41738177419.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/liketaxof.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f969255769---1153855461.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/jutudodilafit.pdfIn PDF document text
    • http://husplaza.hu/editor_up/91606460583.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lizawubuwazuz.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/mobeteruzewo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e257d0e0---81222693245.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/rajefizof.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/996abfa20ac59c72061d7eac79240edf/fisafiponawitex.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/gimoguwim.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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10504 bytes
SHA-256: 342df3bdb7d0ccc5597f68a5715d8d54e3f06f7e021fde691dcc2ba497372fed
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 17296 bytes
SHA-256: 1f8715b4c33c1b521d7b2467933216506cde52f895cf9e0c22041dc13efe0aad

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