Malicious PDF — malware analysis report

Static analysis result for SHA-256 4848142346151dea…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08d108162dbe8d02ae22ec07b02e41b2 SHA-1: 972a5d20c6efb66c43e6fe574c09de38165d7bb6 SHA-256: 4848142346151dea3ee8c92597404ef5cce809a19f393d6b202516fbab15849a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=real+flight+simulator+obb PDF link annotation
    • http://kozelsk-adm.ru/files/uploads/files/32193028652.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/88046764173.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/65782021833.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/detitirubusodixowi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/neziwilelup.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/93df576e57e7dbda35d7a5d85126e444/lejigejirutevulis.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/gurizufa.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/69462354242.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/22104223401.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/jobutajulosisij.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2520097ac4a7a222872e7220f9dad361/77378824134.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/29c36f5e3f031cefe6ebf119bed72daa/konazududokojegixuvikupol.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/8981677309.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a954c713d---lisobuna.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/12657615716.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/73620238375.pdfIn PDF document text
    • http://tyextractor.com/d/files/rojawerolunil.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/gudupiduwowuno.pdfIn PDF document text
    • http://hkalc.com/userfiles/wanerofezi.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/30318852968.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7d57206f8b6357fff5ee8728d2a443c9/94130181019.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/rukoridepexuri.pdfIn PDF document text
    • http://15881588.com/ckupload/files/gajakotasadijijorulef.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/biwanefadedujiw.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/gegonuxibo.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_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 10840 bytes
SHA-256: 8171ea0e8e838c6f450e48e631e8a668144ed4b5d6fe1320ea9ff963d2510160
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 17176 bytes
SHA-256: 8712dc65f6fbf90b94b544f1cc97e8c29cb562bf25fd0540632facaa5b5c1a04
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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