Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2baf4c4d2f2f0…

MALICIOUS

PDF

93.3 KB Created: 2021-09-08 09:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 961e37a7f334661330387e843cb8d8b3 SHA-1: ca78420ce7e60e8f03503c45abd29ca907371f2c SHA-256: 90a2baf4c4d2f2f04b24fe718ddc13740d264ae11fda2269e99513e21f1c7c2e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload storage or disposable hosting. The primary function appears to be redirecting users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://biotledlight.com/userfiles/file///zimepusiguxogunojil.pdf In PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kusel.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0a1cba606f4ae9f83f599ecc05fd71f4/7027352514.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/29030487493.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zexujimavopigotizapon.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/53242481125.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pudg6a63b8svp9lbmfd5e7r8d3/47863421324.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/32830382379.pdfIn PDF document text
    • http://gdaniec.com/upload/files/6567492090.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094104356f75---niwopesimesexab.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607194e4b59fb---99363147843.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8fegn6lkh3qvb8ujmurg87sas4/83114105020.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833485f0491---57531038532.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a34daa3b---kajifoto.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4e846c44a74b7fa46531d67054d2c0cb/42225751832.pdfIn PDF document text
    • https://mauspro.net/upload/files/68457193949.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160787fb315324---gisurigadetanawo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/pesibobarafafak.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/cb23fd0529b9ddc3c908afc73ae08cbb/ridupamujoribosewijivida.pdfIn PDF document text
    • http://brukbet.com/user_images/file/21971881217.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/70d7891c514530591d7bc46c7f296f74/rekigukara.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/36820915020.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/negazawetepumosug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=teks+prosedur+manual+dalam+bahasa+inggrisPDF 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_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 17056 bytes
SHA-256: b16954f0859df177dfa13beee86d7d5966f7dc6c850686b9bc0094c97084007d
font_01_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E04 11036 bytes
SHA-256: e48451b08b2e10b8abc9f9e23390174cc972bb7fcf94dce04240bf2f1b5dbac2

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