Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c61e6d1d76e8659…

MALICIOUS

PDF

81.2 KB Created: 2021-06-30 17:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da35e8444da6c02ecb0d6aa03be0098a SHA-1: 92a7e5053257df04d4274e597a76be734ffcdd9a SHA-256: 2c61e6d1d76e8659115df1de0dc2e1325f79f88016a61dcefeb046c06a6b1bcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics as a link farm on disposable hosting and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cc0f958c7539693efd15431fbc93e19d/fotelupaj.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/dilopim.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/42662252863.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b58a8af5---48871513546.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xizazupogoxit.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/13a8e241fde18bab0c90dc6edb8cfe7a/wirudatazagozapogirekaf.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0ca68852---58456665436.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687b7dff35---59256322174.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607700f00acdd---34109209818.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gitezigetuturam.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/pibaredoretadi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/magidatumijexajez.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/xedopeb.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36e47107---85899324044.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/oe5iv0cknbdu6v6jp1kk4s6vm1/jovabuzogozefonagizupula.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd796919a---93773526008.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/42392892124.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/jajemaxibakipunuketopomin.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8e059564d0856f1c04bdf8b5e79854dd/84021088708.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7921_20210606200301.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ad10bfc96d24a3feea1b71e67eaa0a32/rovibopapetajulo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lvrqsqq6k1ribn5dd7dgud9k24/sadunufep.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/12319248989.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210601_96B73CCA0AE125CD.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jalapeno+lime+coleslawPDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10416 bytes
SHA-256: 50f117f959975d3e004023c2fc15ec652c9ec7be3d3d16cffc68aa3d69a8dcd2
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 17152 bytes
SHA-256: 1296e0daa1f90e160228135d358442b41a7736ca98776b2a24bd7d455d0150ff

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