Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea31df2abd2066…

MALICIOUS

PDF

94.6 KB Created: 2021-07-13 10:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c34d7664f4ea7f6cf71e4c0b231ca2ad SHA-1: f36cf36a2c61ad9ca79e81cc1c55aafd1acae094 SHA-256: fcea31df2abd20663dab6b08f4b72e4f13786f94b233dceba7ef639906ce577e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The file's structure and the presence of multiple external URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/vbp7754ff6omab4moudcetf89c/61822933385.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fq96h26067qvt301q76qhebar7/bifonavifidojixijepiwivo.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/30559993786.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/tesagipogodefopaga.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/tajane.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/4f62244c66f4a087c38213fa1fb79829/61439911478.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28865e693---wiruremexexumajefejolusi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321b8ec015---pejuro.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/kabavose.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa1eb468f8---52871126376.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2f457cf3---petunubibuvakezoseb.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff342c5296---supibiro.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5d8cb69044c7edd6e29ed03b54ecc8e/sazijowafoporibu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jatewibivug.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/98586870008.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5148f454a8---siluxudalovukowaz.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1dbed59ff8481243af6d9a2f90e9e74/67378946761.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/69249396580.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f3c4fcaa---80855890022.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kuxujufemuzonuvonulox.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021050712639_626260780.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/10664350224.pdfIn PDF document text
    • http://renovator.cz/files/file/kugaxuziru.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7ttlg59k9c7bb6ufb6llc6k622/zinilexowadupajemolivabar.pdfIn PDF document text
    • https://maturana.cl/upload/file/24124053515.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608788b5037cd---jawapojuxanebolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=positive+impacts+of+the+columbian+exchangePDF link annotation
    • 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_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 11236 bytes
SHA-256: 085e85598358dff44934bbcf6fb0896449d58ad340d701cf5beed18e9e72fe20
font_01_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 16776 bytes
SHA-256: 11c2a5bd5218c6849b6bb3dfd421309fb611558107fea58838282df38e2d740b

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