Malicious PDF — malware analysis report

Static analysis result for SHA-256 6227efb57e18fcd8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 20:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfb5ca885c201e165707bf437e276273 SHA-1: 5948dc7239a65b4737e6a365efd7abf08d268edd SHA-256: 6227efb57e18fcd8d44898411a0fe2221197bd0ba49f4da470b2a52d7094a6ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the characteristics of a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=independencia+de+las+trece+colonias+inglesas+pdf PDF link annotation
    • http://sineadstone.com/userfiles/file/4095714412.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd135e4bac8---79174150951.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2iqe0prkr3v8c8olmm0gcgupl5/sosazofuvuti.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/49040548197.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tujevofa.pdfIn PDF document text
    • http://kezheng.net/Upload/file/dewuponukobizovabulunigi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34275779b---88205288873.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/tidemolapuwe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bed7b746---91968902803.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021081310022373499.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1eed5a13---bonaxagewazikezabope.pdfIn PDF document text
    • http://nanopena.cz/upload/file/91182890247.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c12383e0---56140558398.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/95164558316.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/32728065115.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5c75e71cac9dde65b8ad791b92e76e8f/7741862981.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6fd368f81afe89217920d3d25dd75453/29329381067.pdfIn PDF document text
    • http://stringladies.cz/userfiles/dijuruval.pdfIn PDF document text
    • https://verner.lt/images/files/fokawipobutu.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/tewajuf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihf1qa446ld6ft3fc6s09mfrp6/ferufufufukarevoti.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/vuvigusipitiwuresit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3d245d25---83319570988.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3b5a37ae53f30738497398c64f3c913a/84393033237.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/64784882943.pdfIn PDF document text
    • 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_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 18648 bytes
SHA-256: a22f2eae85a4c76637deab71fb7b927216d203c3c8af64af8f51871835dddac4
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 10744 bytes
SHA-256: 600b488d3b90fef28f6d58191aa31116054819aba38e902f8cc5c6e3a1ddde54

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