Malicious PDF — malware analysis report

Static analysis result for SHA-256 666a04b32ae1b177…

MALICIOUS

PDF

91.5 KB Created: 2021-08-02 16:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fbb92c1dcb3f4b20e6ddaf8fafda378 SHA-1: deabd919db90887b75c7e3a2d7a9c787d1ac61e6 SHA-256: 666a04b32ae1b177dc6f7688d512c4fd0960177501016b0b1cac98f06a5f55c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d64464509---wotufolaxeladufixixoxurir.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dm8idmfklvidfummo0jsl8n17o/taveweributab.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4d0395fls4738umr8ddkgp6hcb/jagadazefalisilixedaxuta.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759264e51a9---35745368103.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4d5ca1a647cc6792ed4f53965e216b89/zajetajejezonijej.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rikojofekewepobijipev.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/57129368385.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/87629365552.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1e408c46---61935186949.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/peparufuzozobesaranet.pdfIn PDF document text
    • https://togeltop.net/contents//files/92334919948.pdfIn PDF document text
    • http://qzgj.cn/upload/file/57554058412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550433a523---11072305551.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/82ac5qc5jv1bm7edtqu484f5gq/87260153449.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/abea9f92884f68f48d3321f88fc966ec/duxaz.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/deburagonuni.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7sbo353bbtf8uijvng14aq2bsg/vewulupejametolodexareza.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83b6e35e15---modofujowaxolez.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0d3a66306---tanugorukekizozugus.pdfIn PDF document text
    • https://telorgabus.com/contents//files/soziraluxasuvo.pdfIn PDF document text
    • http://mosjob.ru/images/file/57881147257.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gobakasewib.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8q11b0ogucm25rsirb1p9rm63/lurofiresatenopex.pdfIn PDF document text
    • https://strechybenesov.cz/content/32890923870.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52b2a9242---37708281270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+does+xfinity+streaming+tv+box+doPDF 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_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11962 11172 bytes
SHA-256: 194bbcc36e581e01046bf1a0f0b94528b21d0f7fee9cb212521e387df79b3447
font_02_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 17088 bytes
SHA-256: b7443f43f46f133902ba782234ec306fd005831474b4d14eb15c6e30c021fdd0