Malicious PDF — malware analysis report

Static analysis result for SHA-256 55449fd7cab05740…

MALICIOUS

PDF

89.4 KB Created: 2021-08-22 05:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ace2c1ecead2e30fb7060a9a1e506d1 SHA-1: 4a9af6770b067dd8c57bb809618d407a79385888 SHA-256: 55449fd7cab05740ad6ba4167e00d5b1d67b447487c23be5de2260fbaab030e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI and link farm heuristics further supports this, suggesting the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=ulcer+diet+food+list+in+hindi PDF link annotation
    • http://drprdesaihospital.com/uploads/61328749429.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc8c0555b---sufopoxadumuxodisa.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/48190699078.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/vogelumujifanezidon.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/24514092447.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/jowukisidufodipaz.pdfIn PDF document text
    • http://derma-dts.de/files/file/navonozeveradotaz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897cbc99759---papate.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/78396928425.pdfIn PDF document text
    • http://mylodge-naoshima.com/loponuninonikeziluja.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/verovofojudotimakeb.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6582c8363a6a9a6647ddd7012f39a4ff/36129358174.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d8b1f5bbc32dc11c2f2a347eb4b60c30/17777272131.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/44228014453.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/8261533566.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regakizeliwifomomi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/59390649448.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745904aec3e---kozunokiwa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab92b6190d---80772180216.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/29259583963.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/saxurupadok.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/23746197763.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f4126092b1f396bc90f10a75d3509f4/56279007380.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_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 10416 bytes
SHA-256: 24f0f6a8c15fce74b20bcd9d2c4e494732290618fa8d6e221ff47e5331e52ac7
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 16968 bytes
SHA-256: 40b93acba8a2402c0f2fed714d9203510b2c67a1aa5616e74b8949d7eb2c0e1b

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