Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26362dea84c678a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 20:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29a6a3ddbaa4d92b0134aab5470a8d98 SHA-1: 4239c85f63ad13ef9b25669a75d794ffc6176201 SHA-256: f26362dea84c678a165afb04d8f9e88f5b50984bf94a6442e31cdb9365062f91
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://lpxs168.com/filespath/files/20210908070003.pdf In PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/nuzegipo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f48067a15---wiluxajosubedurowujo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/5021667470.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/54473391634.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bc2c4012---47109702225.pdfPDF link annotation
    • http://auburn-companies.com/userfiles/files/29431233869.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/sibip.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/28992099976.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/54153889636.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210917121838.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lusubirum.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jigadujokapom.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/539921c5b5a8e08f189f55f08de8d1d6/49920188337.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7ca494a4---fijopa.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/22532039958.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/2824315922.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/75022596538.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ronod.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/naxarix.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/49028806622.pdfIn PDF document text
    • https://mavibusiness.it/file/talurobofelotazedit.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/benas.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/34635965776.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613841d02611b---xubopejesib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=miui+11+for+redmi+note+8+proPDF 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 17980 bytes
SHA-256: 9773d36b1b0b14a964a71ac7aae046291b1edf1a81a821e0d233ebf9e324d85d
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10636 bytes
SHA-256: 489838a1f027abad501acf8500aa73c76301022b3c7506edf47dd4073991b0fa
font_02_sfnt_off000120a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1