Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3d5cee1b9a12d0…

MALICIOUS

PDF

107.2 KB Created: 2021-06-26 08:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 90c36c908ff3678cd3fb25a161c9c785 SHA-1: 23614dac1ccfe70f8703a9f28ca02c56bc2ab1ca SHA-256: dd3d5cee1b9a12d01f3ba108e9bd119d6a2f15af22430abddef2dacc6af9a9f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alianzatours.com/imagenes/file/pakis.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/cb828e6789df6f325a4627f2596c1a7d/80214813768.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0930795---luxebavebim.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/928b490587952500112783fcaa40f122/nabaxipavegivomulaxojisi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d942ac45f---19293290294.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9762cc10---lujanenefegijatabesudepe.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/renixenexozivuluw.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/mirugisex.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6136c1d29e---15881393477.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/gixumuf.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a62ff4f3e1dd2a35af1bcb76b6edbb95/44848004722.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/80398322058.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/wefakigopovologobulup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/12730937273.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zipexarov.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4de36cc0---xixatiz.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/rutekawazitedozuninubebe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/mafijomopovanedufadidaj.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v892aj4n6698gqnik4jhop0b02/merixonefino.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/xatijolerasitefubewez.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f7r27htalpf3esbhbg4om2rmmq/25258339050.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///15571148029.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/325c733612c4050f0f87e9d3f938ce5f/bapubitebexefudenamenu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a431bb984df0ca90f849f7e3a74182c8/jatukusevutokole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=crater+in+a+sentencePDF 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_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 10088 bytes
SHA-256: 648b63727e93e380db9c406460dec99c9894b1992c792982dd499be1ad8b3b77
font_01_sfnt_off00015be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE9 17208 bytes
SHA-256: d3707d3d011b034a448469be281c62a5f646070ca5714549b4e5bc8b8034e083
font_02_sfnt_off000188e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1