Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e54c6d9cb800ae…

MALICIOUS

PDF

81.4 KB Created: 2021-06-26 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 484a75b947bee487798a29521908cb8b SHA-1: 0ede3c3a68d24a2d1862587bfe00b483c240abd6 SHA-256: a6e54c6d9cb800aed6c810e03c3e1f6d273a44d5f9d96c298a4eec8b0bdc9e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. 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 analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://urparitet.ru/admin/ckfinder/userfiles/files/kimepidex.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ec221cf2261f0156d9869c2114f7f53/bafutil.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/37617913379.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919d5200cb5---raxesokunudilituxerepiz.pdf
    • http://stellamaris.cz/userfiles/89639007041.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/3403511164.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c362d1da9---raniwexufimomut.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/82946cd2ca010b0a831e44c8f251916e/44376412657.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/85f59644c6f18810e8cff83869b748a6/futepovigobedisikesubu.pdf
    • https://muzeumkonstancina.pl/attachments/file/zaduxixofexutovoxubage.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/8ml70glb2dh2ubu79fq577fj4h/79595008740.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/732debde700f2d25f91170922a273dc0/89252427991.pdf
    • http://nexxosrealty.com/userfiles/files/bamivowutaxaxofo.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/88bf90d31c7d9e626795a932b6fcaa8a/84423590599.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lakipariliraderodepaso.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-7/20210607104739120497.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff6d8179c---71778376862.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4fb28c03---mekivatofevufevekaso.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdc93ab34---gidadimitijeb.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe2b82cb6---28980061245.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rhqm8j244u4ethh7l63rhasobv/34644015520.pdf
    • https://auto-rujo.com/images-editor/file/bukevetemeriviwawagetudo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7e5dcbc32---siwabusojuzigogojawereb.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2ikav6t3ejcvrqof64snnmnsl3/87185078020.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/5497121021.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=baked+sweet+potato+with+spinach
    • 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_off0000db3d.bin
b68387126e77a0033cd47d65e21cd99bda12605c2f8c2bfdd887cee2335140ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10696 bytes
font_01_sfnt_off0000f3d9.bin
6379ee84166ae3e47d6302d080e0421622aac771b08d5126ed5af3a788b3b230
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16964 bytes
font_02_sfnt_off00011ff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 16792 bytes