Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1273a8694944e4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 12:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 245ef1a6bdb71f4641412e9c9d827e9f SHA-1: a7c018f435b863a627c91cdb7ed8908922db2c59 SHA-256: 2d1273a8694944e46c5ad30d83d9a3864ae83290fab0e0e994725d8f480b5ede
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a large number of URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=oseanografi+kimia+pdf PDF link annotation
    • https://littlelightnepal.org/userfiles/file/wiwapimad.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52978fa48---99145180647.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/65606939325.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/67756772623.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/xatemizolulowonej.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9169f43bcb---lanisopi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c942bed06f---93393409718.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/66356701243.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/kefusatage.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/28208400023.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/10842942965.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607239736809f---sozawenesase.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c9c44f55a2057e099bd4936b12748fb0/mowivovazosedogevupabo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609be18b49f70---nazukulomixupafejod.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/xazesobif.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612deed0a11c4---dusifejibovi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d3453a654c025bd0e12a5b3e7bd1000/vejekupigijaloruxujo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120196a439b3---40669799662.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f0f19b1---79632527563.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/7165491784.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/35052750123.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_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 10816 bytes
SHA-256: 75047d0aa5fc4b234df5e173d398c13d32eb1be35c89cacf03ac605c6750e7e3
font_01_sfnt_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 17080 bytes
SHA-256: d1445f1039e38082e700ccd9ea1d213736f5ae2158a5cb5014f05e7b72443935
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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