Malicious PDF — malware analysis report

Static analysis result for SHA-256 21034324745ab011…

MALICIOUS

PDF

73.1 KB Created: 2021-08-28 05:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f883cbbf00025ac792821fe76eb36773 SHA-1: fb7fa5ffd4ab260306508947e314fcba0a834f9b SHA-256: 21034324745ab011d6df5d06136e8ed2d40244363bc726f9300edf360f660e86
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 websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=chow+and+lab PDF link annotation
    • https://fotobolfestmeny.hu/mvc/userfiles/file/72038827286.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jilero.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/bonuruduzapenawizub.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4fde54277---35369516352.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/56395249963.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/206e6d8615ac7bf8f9e86eea3fbc591d/lunaxetewogomusalavupupop.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608436db82c63---48263605504.pdfIn PDF document text
    • http://blueyee.com/upload/file/031225499357.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/36830766525.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cccn6h5id0tjvj2j37j6v76653/41094972279.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/tagixajumeri.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5d2cfafd---27549975748.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda44cae55b---29612643217.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/moxonabe.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hsph00l4amoeevbri2f4pvbtpf/45887782393.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/44341360668.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e7008dc843aff86bbbdd456ec145e8e0/gebokumuxenogeni.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/f37h45d2to4tvub8mjsjl8bk6m/gupofineremeb.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/39433829538.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29597081d---81173421088.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zojiwabivafa.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/6733482812.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jesaporivebiralon.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/gubekomevujiwukalolexemej.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_off0000c04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04C 15744 bytes
SHA-256: 9e60d8c9407710dd4fbd3c9cde91c7e7dd3ce7ea41c7a4487b237edd4058e37a
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 10012 bytes
SHA-256: c9232b6fd38460da4cc5700163676378cc8db6162e30911299f2307914ec4501
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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