Malicious PDF — malware analysis report

Static analysis result for SHA-256 373661718dc48b09…

MALICIOUS

PDF

92.2 KB Created: 2021-07-05 01:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53563d1e1f7e73578bf55be2ea99fc04 SHA-1: bd58aba4750ffc3a12c40f2dd6d7d13031927b9e SHA-256: 373661718dc48b097203e5056d40a674fc2dde0591b480e473697996ff700349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS uploads or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://alshamiltrading.com/alshamilfiles/file/41190662716.pdf In PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/79968118638.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fca93978---42327625135.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7a124425592322c3b8d4cb1f6eecc4f2/53029281080.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vilad.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/74102464460.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1b25b17ca9c75347a0fd46adac908ef5/86104758258.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9a1bfdf7---2778961207.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909401d7976---28170828312.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af637902243---fagopefavixexolevujaxip.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h3gdkaai0bfair360g6olbair4/dubimotebuzirulakapexu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/akdau05chqb4hl8n8m48oupsrj/54219000313.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d06814d2---kabagimedomakuwagomuz.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/23332154082.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8776c380a2---12924120554.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zirokonanivotix.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/fozasowatubifakefewi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8r8na8k214alikkrkgio8igmbt/kedolilabozuwizolirozal.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ot81nbf3da7f7ha6bic81otung/39308083239.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1b7c4ee20727b2c390adfff3371b5d4b/tuvimoluxedemezavipo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae7261a8c---visapugitixexobubupoxatov.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f35ee0f---razobazowejirexapu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/57285421493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=learning+objectives+bloom%27s+taxonomy+verbsPDF 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_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 11116 bytes
SHA-256: 4604a5e90794459cf0f8ccad89af99778bc624416626c53cd7ed13798753a371
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 17112 bytes
SHA-256: b80079ebe15ae3b77a382ceb2a82ca90b92e70169fdbf00e6e9f2263460088ba

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