Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fa13e00dec1b3b…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 09:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 521d1f73c43052d73f2d296bab18ff58 SHA-1: 79880087f96399ae63047f730d1f0ba8f7d72353 SHA-256: 33fa13e00dec1b3b1fd8baa5add077bd916a07c974110216b00f3e7ba9e8513f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URI links and the overall structure indicate an attempt to redirect users to malicious content.

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://nomylo.ru/uplcv?utm_term=telecharger+word+to+pdf PDF link annotation
    • https://anukulagrotech.com/userfiles/file/21138037585.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/81441370305.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25491857892.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608858bd70e2f---mokewuvemerabukameweto.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/210672b1f3de8a1a7aaee8a733cb14eb/pibego.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfb1144eb---ruxiwibikojobipudevunaxa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c04ee514---79004869174.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f27845eb0---67335599936.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2851f54---lesugeke.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146fc7fb97---bagenib.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zopipakazifob.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090284496fc8---xifutorokubevuwevosebedo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25b8a0547---92442230221.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cvcavlt9h8t0gme2gqirrf97av/wijomitapesejeni.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609570d840c0d---memitakowazarazurufujujer.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/718aa0373ac2f6e9e57559cb8acaaeac/zufajuwebajafagetiretugo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e7d9f7ba---vamutupifogidi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e1a4ecefefdd9422f20066d498efab56/35202755039.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9544fab72201a4c518ad99ba5dc56ef6/bilojazevujomolagipopami.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/06f208366745e87594de54412ab0ad06/27743198519.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/62406898530.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ee6b3597---gutomuvu.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/bozukewesigudisosexov.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3f73a619461a6b6fe0e88c8b5e511e75/lupojinurajedoxewa.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/57358509327.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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 18052 bytes
SHA-256: 50dc582f24c753491285ec85036531e67d9a5c8cc6969f4bcb5569ff79f5dac0
font_01_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 10584 bytes
SHA-256: bba1c7f1ad8a4cfedd24bde517f4b382e9c8e44aa3c215edb8e9aed988cac252
font_02_sfnt_off00012cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1