Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a18d1ef08d418e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 16:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea5f9e053b7c1845016bf63a539e1c49 SHA-1: 6169c3a365f07930adae85bb5ee54e2546ad22fd SHA-256: 78a18d1ef08d418e9fbd085ab642274f4478990ae8b4b311d0f7b347a9e54867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://globalmediaminds.com/uploads/files/95958185456.pdf In PDF document text
    • https://k-newsletter.com/ckupload/files/gajodudatararopibugisumo.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wafanowujezudubexasuraguz.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135004763264.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/96173345891.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/45768139454.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ft1t87aeoin6e0t2aln2hsldjl/21457376822.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zeninimaxejonavaxeperega.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc5ca0c2b---89068173590.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/mupuxut.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/remazogusibanip.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wirelopijuzuku.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9336051827.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/40060837366.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387b89180f8---96355376367.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/81779449cd0ac895a2b7db2d652a244c/gunawegoribupisamokivo.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/17212185413.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/nanuvojeza.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/67145771320.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/lofifupapalijutapite.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b93c2eb3e---87983471571.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/razovelelekogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=haryana+police+si+syllabus+2018+pdf+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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 21848 bytes
SHA-256: 79696740a15d3bd4faf697b4a537b14e638d6ec567dca884dc5b96150eb54543
font_02_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 11448 bytes
SHA-256: f42c537715583ceedba4695895b98671856bff357158bc074ca922fafe8c88e8