Malicious PDF — malware analysis report

Static analysis result for SHA-256 871e2b16a9a75840…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 12:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fadc871fd7064fd79fa580cc887c7cb6 SHA-1: 2300f0d95f6882059da66f4e2ee46092f84fb598 SHA-256: 871e2b16a9a75840846854648eb998bf482eeece85ac92175059ee9d62e8f174
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd9f2dd3e---fuvegovavoxuleretopedigiw.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/70149570812.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qv78ead7ccfl3ngal66pfaj702/62757526437.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/h78h1tjh3munujb9fkou4koof5/29739303638.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/disisamofubug.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/37718508486.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/85247051994.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c8cc601e---29043963089.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f8d9dd72---werifegupagosav.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/xifevibumimolifanulo.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8b34bef673316f891412afaec66fc57/vezajepukokekadexe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g4n9mcj6g48229e06qrr00rve5/1491399683.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9e29cb7e849782248b669d9f3ed4c19d/59812622024.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f95859bb8062df2d30dddef4ef88b7c9/rokokurupedigesevavutu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/b10pc8t62m6gqjpnl5dmmb893d/woxare.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/82479215142.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/abe9ebee2e963c142b099d28a235609b/vezokumitinisunubokemakut.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/waretonufuwiv.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/tarexujidete.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/19615018347.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mujupulurozovupugarawu.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/80835494878.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9ba21d4b---xusisurunakudovutotusi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608139f4ee4c7---59202315411.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/526d880c44f15cb7574cc3c052da82b1/23296705986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=milify+city+downloadPDF link annotation
    • 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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 16704 bytes
SHA-256: 89d98ecf5b56c1d71cd400dd60e5d2053f6950b32764bcbb9b2a51f9bce731fb
font_01_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10264 bytes
SHA-256: fae0f926edc93d7bff96eff2eca5ace8c225a01171f4b3ee7762af9db1b35d96
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1