Malicious PDF — malware analysis report

Static analysis result for SHA-256 861fde65dc406b4e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 01:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbbac42045c00e55b329f362b157c6b5 SHA-1: f074c7371bca2526e420e877935ff36ea1f40a0d SHA-256: 861fde65dc406b4eefb9f9d716461f4bee9fa96d5d34eb36f85ac8bde8c07fa8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=tamilyogi+new+site PDF link annotation
    • https://ripedzn.com/app/webroot/files/fckeditor/file/texezogok.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wajunepepesorisotapanibu.pdfIn PDF document text
    • http://krzeptowski.pl/file/35448292188.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/stfi598j8cg7ni2enpm3tghf46/zaguxezunofujole.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b0ce34a14c4625f2c4733e3d2fe7162/boneguxixovepuwapadipefaf.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109040849204240.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/89718288041.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/wudurujodesajokavuniraka.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/89984432636.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf13b0a26---luzawajananewe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbc3953f9---lifowozitelajasafekulolo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/27465844898.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/55018696858.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210924193535_mi6w7d.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/57935863524.pdfIn PDF document text
    • http://allier-genealogie.org/File:/manipiwibimigugatofigusog.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb0ae0b379---govapikuji.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18728927b---rurixo.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/jomiduzaxuvuradudil.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/fupumuturovo.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25302752996.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/finuzazukemi.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/janewugebofu.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/47302468586.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee97a87d6---59145188390.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13163374798.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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16132 bytes
SHA-256: 11a5cb6094270b41ff75c232783ce06a0e306d42a535acc1fad67d54180cb19b
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 10512 bytes
SHA-256: 044913b7aa3e18c4149790d28d032e35db69d8d875b9e08891541633675d70be
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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