Malicious PDF — malware analysis report

Static analysis result for SHA-256 783af92133f36794…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ede7d3e667423cdadd61f8d8a8005f5 SHA-1: 1b74695c54f3c9d7b812f01518a7030b2aad122c SHA-256: 783af92133f3679432f0cf7000d853885a0ddb1a43d707190bc18ab5335302e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to files hosted on compromised WordPress sites, indicating a link farm or SEO poisoning attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose beyond acting as a gateway to other potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e96f943cd---26941557095.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/zemenekerupavodudos.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • https://andhimazhai.com/images/files/50790493865.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/80188971695.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48756448656.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614e72101e31f---35291484297.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wogizitijijido.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/8925259726.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/wejupimipuv.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdedfc6030---lomudujuminomilorone.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f8fe7bb6---virorivajoviwo.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vadetunirawoxovojujapuzu.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/jiwitemokigejopofesodi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/59fb23447ec02771682b1a4c2db9942b/73276976339.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109140005567169.pdfIn PDF document text
    • http://contelex.it/userfiles/files/35912858573.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/mafotopemidututuk.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/9009516809.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vebatenupegosotuses.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/bozajose.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/nupoxivunarunudutalolaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+s3+mini+charging+portPDF 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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 10988 bytes
SHA-256: 9ee1b3892284af7bd16abe2f4d061dbc034f9c033d61fb9f561f98be8be4060b
font_02_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 15504 bytes
SHA-256: 6687f70e41ba777984798ae1d673afe1601f805bf50325ce94d608de099142be

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