Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56a59cd3459867e…

MALICIOUS

PDF

112.4 KB Created: 2021-09-03 17:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2b8b3fd28ca297a9a60909dd557d904 SHA-1: fa5f8d60a7f3eb9e55193fb834462d35f1120b2b SHA-256: c56a59cd3459867ef568b301e1ee686de5de0cb314d1ecaf7af38655220b7446
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users through a link farm to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f39854a6---46232717810.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0a2d0838---tejebu.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/4f5066f38ec37a3c2c82dc00cecc7361/87612332477.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/pefuseguzofavisepepu.pdfIn PDF document text
    • https://studiorampinelli.com/file/wogelirez.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9c5729bfed79b69a11129441dca42c1b/90292156543.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/1669597300.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a985b4be8be---40298798527.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lifilo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/96908688562.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/533517fd7e397d8bbd2d3fcbdb3e771c/dexajiretatupeguzeti.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/buledoje.pdfIn PDF document text
    • https://daismene.it/file/lekaxudevukuvanamusunadal.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160843a4051191---dewofovulatuwevidazisewow.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/36492770489.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/newekivunedipifujidivade.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/809915b90ba9a205a61868e4063f5bf5/xipurifosajoxufar.pdfIn PDF document text
    • http://armanetti.com/images/59881935537.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/9a9fbae9597df71ef73169cc838c286e/73590737173.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/46595231500.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/65892322493.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d21e17b7d48---liberel.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/muzuneragolativago.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/peluteravaxemukafugava.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d232160bf3---56351159103.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/65213908609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gli+italiani+luigi+barzini+pdfPDF 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_off00015368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15368 18320 bytes
SHA-256: 7edde99885536e8b55ff5e6a3e61cd426e60fe006b2a8d218f315f38dbcc2638
font_01_sfnt_off000183dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BF4 10592 bytes
SHA-256: 5f7f27d9b48c7c9577d8ce416887abde06bec8af7ff850a46c545354409045e1

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