Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0dd21a5ede3dd4…

MALICIOUS

PDF

87.7 KB Created: 2021-08-25 05:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f1981a5e928c302091dcc4d1df3db84 SHA-1: 1e1e525cf6ebb3a1b3e5c66dcf7bb678c8433d31 SHA-256: 9d0dd21a5ede3dd49ceb11669e5cce6015f77a663e3089b514aca0d019e2502a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The file's structure and embedded links align with common tactics for delivering secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/96115658913.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a633af62ef6---37649672295.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608128f3186a8---dawiwuxuradasujos.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/segopomusovuxifuw.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/rosupibotubaju.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4d1864f3---wenosumuvatotizedukugek.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/wemudasikopubisukebivefan.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tp1rv6ruobqq8ms0dkirlgbqhp/darabag.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/maporugiwegefuwiw.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/47727411986.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/77094989050.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/bovusevekemejelejedaza.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7pf2h8o9o9550duu8dg19lo7hs/widutezo.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/43684363373.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a1c4d3d08582c22b6656c9e03d18f24/91240156513.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b0c92f1aa---luvurezelukafozusazegesaf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2752536ba4---zegosafagowipuwaz.pdfIn PDF document text
    • https://lasanisports.com/files/40517872984.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/botenixelisabuja.pdfIn PDF document text
    • http://fedoro.ru/upload/file/pisutox.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2d1afab9526214aeab55ed636bca1aa3/75032826874.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/goxoxu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/7422174513.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/90469820475.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/lakiniwawijata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=other+words+for+describingPDF 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_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 17356 bytes
SHA-256: 44b049912b504dc103b196e4b5295ee6cec02f4b52fb8b2cf47630f8a12ea62b
font_01_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AE 10796 bytes
SHA-256: 7fdea5830f05e76d3d2cde3b3ab29ac76d05c0b655795d034b1253aeaa83229e

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