Malicious PDF — malware analysis report

Static analysis result for SHA-256 c511a576b153e6e3…

MALICIOUS

PDF

96.7 KB Created: 2021-09-07 11:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0f12f21188b5d21cce107fbbd077b03 SHA-1: c2f563876a693157447d777b612ab2ba5c927862 SHA-256: c511a576b153e6e391af4a390d9931327ade4580d4729dd8572617b122691003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://drafthe.ru/uplcv?utm_term=comprehension+worksheets+grade+12 PDF link annotation
    • http://jmk.kr/ckfinder/userfiles/files/65532867060.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/90936557187.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085098d69a91---dasorepizaxonej.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/238803920975fa102fc73ded4e6598c2/bogagajepaxozol.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/gejowoxetatifimota.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2edfbe25c4bf869e51a17a09be316e18/39068828396.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4f4c5fdede232186099526ee8a4d4539/25859872478.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/67156382019.pdfIn PDF document text
    • http://rc-modeller.se/images/file///84052766523.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/bekaririwimov.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/51938150976.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fdd49369---98346527452.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/supikitamujebilanu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/negapuweva.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41999321917.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4bfb6a15---wasiwujok.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a404247f9---27387450251.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/webogasedabuvukosuruwupu.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/55270662671.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/45624510235.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7da0331bc---81450988706.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758f5571c87---tivubivoz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad4a5a6f3---72991380852.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/45936844218.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/28808796707.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/13504518956.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_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC1 11176 bytes
SHA-256: 9ab4c92b74443093e55fcc4f8bed3fb18fec2bbdaac20ab3382d83697a506b99
font_02_sfnt_off000145ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 18136 bytes
SHA-256: 3cd7c256734ee30ac85718d496b094c7315021025bf6d9440c619facedf52b04

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