Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ca2bccf72a5e35…

MALICIOUS

PDF

93.5 KB Created: 2021-08-08 04:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0aa85177a0293ce893ca12d5b7c1136a SHA-1: 51825dda1a7290051572ccc15bf75623ce0bff2c SHA-256: b0ca2bccf72a5e3552090e0be284e5b009bdfa1c691ce30177e63646467eab8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links form a link farm, suggesting the document's purpose is to redirect users to potentially malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=how+to+analyze+awr+report+for+performance+issues PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a47240a6---detiwenusezezoxebitukopab.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zamevega.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5ad78fab20308b2e6c506f758b2fd535/34731418356.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210622010213182638ypn27hh66uk1.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/dotujipiropo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/90280334236.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hg2g8k45pskv1amko9dpla2ld6/1036257094.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c589d69f6ff---82340453130.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091888179b24---vonuzolotipitaten.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/19683144556.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xafavaga.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106280926208673878l4ms2.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd1279e5d---zekoxu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377036482f---giraregel.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed768a238---58153995032.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/ditewuxotivovuzoropiwovap.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/17953682623.pdfIn PDF document text
    • https://emprenderem.cl/files/56611536335.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9e1849d49fe6ba864e8a7432399de144/gizigijowoxepitefunem.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/67598583110.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/73806300867.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b14775e0fd56228abb040ccbd763a8e2/gegowolasatifopugixopolox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781aa1cf155---nopipixivoforalo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l5k6ojgjnrqvu3ijhjfi194mk5/58872954482.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_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 10992 bytes
SHA-256: accd6c73b82474d2ed87978ec24a3ee9ef9eb6f6dac7c7388db2aa9a5eecafce
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 18068 bytes
SHA-256: 2f35a5874319c52d221cb4e7d19ed4930a30ff4e0f353832986b193de11979ce