Malicious PDF — malware analysis report

Static analysis result for SHA-256 b431a1812f79e120…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 14:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46aeeccfb9a39c86306ae9b71041472b SHA-1: cdaf9b7deb15a7ffd805e7ed1b24b5333cf45051 SHA-256: b431a1812f79e12036987377619f874833aa1c049628d9f99a6198c46df08411
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 exploiting vulnerabilities or delivering malicious content. It also contains numerous external URIs and links to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=gta+5+download+for+redmi PDF link annotation
    • https://eirai.org/editor/ckfinder/userfiles/files/46836472852.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/wijisug.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/39614900014.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/sukexepesixadidi.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/71232649040.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/9719332072.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a963e648---sataw.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/gelubepekinu.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109200713222181.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/rosatumisur.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/93113295044.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/102171411.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/97183632678.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/92446352142.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/jajasowawenululokafariz.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rgjovjvbtd9dn3uqkioqbn77lu/86699612283.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c70251df7---tavajejozugeluximop.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/45087241119.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/31963701657.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/92256261303.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613daad684a42---58008122409.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/79530069881.pdfIn PDF document text
    • http://hybsch.it/upload/file/51221467505.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/4289080179.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/mofozirelirilapiruvojan.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 10608 bytes
SHA-256: d790409d7fee7a7aada518848c6d0c2bfc6c95a4d8952890fbb85badeb0f28bc
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17404 bytes
SHA-256: a423b5cfc82d823f0e83840ecc77ac0d49106e969f1562034e39176f7c81d7ef
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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