Malicious PDF — malware analysis report

Static analysis result for SHA-256 726ef874c479a2e5…

MALICIOUS

PDF

95.1 KB Created: 2021-09-17 00:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 62ee1055cc1cc42978f339e6b9ecd6ac SHA-1: a56f2b68c017ba235d0cbb90399e30b99e7c5987 SHA-256: 726ef874c479a2e5908196df4018de2d6200982d60d42a420041315a170253bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Furthermore, the document exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. These elements suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://archism.ru/uplcv?utm_term=new+bollywood+movies+2021+watch+online+free PDF link annotation
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/57612417188.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/65514559007.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340c1445f67---89915709967.pdfIn PDF document text
    • https://emenu.hu/editor_up/16422923936.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/rawaninofatumawosafekogo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba8697fd5---472936737.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/malugonotukonipix.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bolunelowugolegelasebutap.pdfIn PDF document text
    • https://nevisnews.com/userfiles/47390692768.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/xuvuxisoxida.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/10003653262.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/73136707713.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/rasixofuwitimikudadova.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/98221136261.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xovofob.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/48025520766.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jusozija.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/lewemivafedezepebiditex.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/funudodanimatumeluvuwiro.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/litipumit.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c0a5d033---2192149916.pdfIn PDF document text
    • http://vo23.ru/upload/file/jipozirokudidosalo.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/sojutasezoxo.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_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 11420 bytes
SHA-256: 435a4dd6bf6277e75990b2427c1914b39adc3a48113a4e21a1b1f9aaff702e06
font_02_sfnt_off00013b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B93 19312 bytes
SHA-256: b4ec283e0255a9ed3014d9bfd9262857ed94fb25a7f7b7e9bf840411de131553

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