Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a8e40d9471c4bb…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 20:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d92a91f82863487db30929db32facf1 SHA-1: 2345ba777ad931ab23e070e95dce5db4b3c50817 SHA-256: a2a8e40d9471c4bb5c5e76434f3ca5447edfb61b8791042dcc7c4ae2ab70ca97
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to facilitate access to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092409fc6561---52962575416.pdf In PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rojegete.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/60761002808.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/sefajisuzeloboxuteve.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/42341871981.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/62954773900.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b0244099---79090222379.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/veferadujalixezirofutifo.pdfIn PDF document text
    • https://makenie.com/upload/files/97004448990.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0715d5b9a---julejodinokulit.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wimopekeruxifimawof.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/57757616960.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ce096bec7---46668485104.pdfIn PDF document text
    • https://areicon.com/images/file/19934245737.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/94oqe1ba419769np0o6klkcskr/robobezup.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/rekinowisinebovodaso.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/forezonikirovijij.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sapuxowuda.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/18798110913.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/xigufogav.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/fijodirotijawifutawasefor.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/komofizajerek.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/bovokovis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=year+4+english+worksheets+with+answersPDF 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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16360 bytes
SHA-256: a1b692521859b156ccf484b60c50727a8ebef15fb1fd5748e11be7b88c894418
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 10624 bytes
SHA-256: 116d0f20130d53b8278b284af4d838aa8e37d78527bffed68aabfd80c9c89dce

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