Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5c541c78301724…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 07:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5bbfc6ed349c64e38d759d94e516821 SHA-1: f7ce793809d6291fc0dd42ed7b8d2b02f184a9ae SHA-256: 0b5c541c78301724b2dd3ba62429ec906419188724ec06c133e6f1171e576f01
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=virtual+hack+apk PDF link annotation
    • http://tuvanthanhlapcongty.biz/upload/ck/files/sifumalurinilatixiwefiz.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/1058192394.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/fetotoji.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vimivejuwefozinuwi.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/74521687586.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/23656519998.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/41530902708.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/sukojiloti.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/47165776013.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139529590a97---jelox.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/nemut.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/lusogezutajekod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/13b1804519cfc230bc0bbd1bd03ae60f/bigowadadazize.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5a17d42---xeguf.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/36049916660.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/13050240210.pdfIn PDF document text
    • http://northcity.rs/slike/files/bowawolixi.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/gebeligavovuzuwewabej.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/83868626689.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/dazinesatutazurovuzukem.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/liwos.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/96652612403.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/84522774460.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pilinofosowenupo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/nuxokojivobotugemulofifi.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_off0000bfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 18728 bytes
SHA-256: 944871933341af2d543f4cbffc558141495a8c45d12f91360f563a5425453427
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 10108 bytes
SHA-256: 10a1305b9e35c47506353ad8b0fa21adb411658d5862484e7e8a57d18ce6933f

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