Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b77a078e771f613…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 02:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9cc362e9d98a021c5b4a3f52676e3db SHA-1: c53bf4d83ee5b04300b9e20be35cefea783e2b7b SHA-256: 9b77a078e771f6132eb6ec3745fd25130ba130f79fc4d93936d42f316e31631b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://sailstudy.in/ckfinder/userfiles/files/gozawitofugugumi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3bbd072f6d0467ad8d84e85145239aa3/34026285971.pdf
    • https://meesens.be/KrMee/Tekstverwerker/wepowil.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/762a4267204db6a10cd10a3af2682cd0/78823919879.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/160a2011ac7d9a6a03995367efb22d77/xexidareriwitefa.pdf
    • http://movietek.vn/hinh-anh/files/zujedekat.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9427a0b720---56834921169.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef05b0788b---53069714840.pdf
    • https://cortemadera.com/wysiwygfiles/file/48084275318.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873f3f8273c---12928321007.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bujvm7n1snpf2kktl8ejcqbhe4/21267514993.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebcc5991d6---vigapufuwigubife.pdf
    • https://tonwen.org/userfiles/file/57755567050.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eb9ad84c288f76081a009492a0d7213a/72186520670.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb49cd1e9---buxike.pdf
    • http://anvlaw.com/userfiles/file/18343949023.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1c5dc394---7743176167.pdf
    • https://aronabritcan.com/userfiles/file/wadidonotovuma.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb408ed23a0---xeres.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pikg7g6p7a9fktbgj7d3bd3kc8/kufakobipujegovaj.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/vk1f79qcu7qacjhtf59tf10098/51987942171.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c14e1cda3---sobilevokugapusog.pdf
    • http://csc-021.com/userfiles/file/20210613171902_ogu4l0.pdf
    • https://luyenthitoeic.info/userfiles/file/78208176360.pdf
    • https://wendi101.com/userfiles/file/pedumurozan.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/494075eebbb16bd7c22cef37ac56d998/8463722629.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/29f0b3696eee77d2d6bcfc4d53fd02f4/fowixafelikobijozevubikox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hitchcock%27s+the+39
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
font_01_sfnt_off000120fa.bin
27b6ff6ebc5717f3c9df1b431ba82974816bc3601d87917368788a91ecab23f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 17480 bytes
font_02_sfnt_off00014f24.bin
5f8253d26890ead7cf7cd54e690ab5f341f991e63679965a4a10bbcc91e82d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F24 10372 bytes

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