Malicious PDF — malware analysis report

Static analysis result for SHA-256 4297dce7f83b9b36…

MALICIOUS

PDF

81.8 KB Created: 2021-06-26 18:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eefa81eb31471e7284db82496d5ea91 SHA-1: 16f65a7cd68bcdc3f250cb62b23e0b26dd869f2b SHA-256: 4297dce7f83b9b361d43f215d95d1a7cb5a2d3899935ebdee82016f489e5fb50
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of a link farm on compromised CMS uploads points to a phishing or download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cfd92bda579380abd8e1c21ea23e0429/36752358388.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf72c2919---37982018225.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ed7509287521f79d6a7ae33a98ac8c47/46229850226.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/24cd54fd34cede689f42f80e892a234f/35109924681.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940c8179ff0---89744944619.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/50712375423.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9737b5326---94213932552.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/27e2b8301bc4bdd8f58970deca16bba4/jurulodevirefuliwaniviv.pdf
    • https://thietbidiensino.vn/media/ftp/file/75684412980.pdf
    • http://ithaca1962.com/clients/41687/File/tilunipiwikuz.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a108d78cc3---83179509924.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/08462e9455e8d74dc4034c946bf21a6a/kuxemun.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607729c579483---fifobupozeno.pdf
    • http://beastyenergy.com/userfiles/file/26479407898.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084187c87718---68167550992.pdf
    • https://transport-vehicules.fr/userfiles/file/todupobibijofenabuzu.pdf
    • http://azizolace.cz/images/file/zurofiwesajuwaximav.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc7cc5a7b---weduzeloveri.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d1e99b00---mitizorizifegasowexuvozoj.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a16ef4e2---43006482988.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/bcabb4e0ed661cbabd949a73c5318013/96043883764.pdf
    • http://wwpokebar.com/uploads/files/45119251810.pdf
    • http://silesiacapital.eu/data/file/fupobegaxopoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=telecommunication+switching+systems+and+networks+pdf+free+download
    • 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_off0000dbc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 16792 bytes
font_01_sfnt_off0000f3d2.bin
39a1a8f7105c7e5d5b2cdd1e880b0dddc766548a80df7b87f707c9333a9b36f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16492 bytes
font_02_sfnt_off00011e75.bin
da2ef9c4a676d68e9435c1289a6c9c9f733c4667dfbcb6f82713a1f6e185a60c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 11420 bytes