Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb1596886e109f8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 02:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a60a919e237c88b330fd98a17a466095 SHA-1: c03843e1558f37d2aeb8138f4ce9267ce0b9e443 SHA-256: eeb1596886e109f81d19d4ee64a0d6ca47b359afa5c638de90fc8c3fbf65d4aa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to potentially compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a distribution point for phishing or malware, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140107b8e0cf---nunibapimexi.pdf In PDF document text
    • http://auto-rad.pl/userfiles/file/vaxopesogumepuwejobup.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/31727203213.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161470df7c3792---85857831772.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/juxovowirobelefirika.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/tilinesuk.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/rilukulajoxubikigiguvaraf.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/wewodip.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-19/20210919123700177907.pdfIn PDF document text
    • https://wonkingchina.com/d/files/duxaxijorolube.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/kapovibutu.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/bojexawolimebu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d655c27d---dowaweguzunibelabunibi.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/sapato.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/8108090429.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614989fe84a6b---tevuwidenaze.pdfIn PDF document text
    • http://15881588.com/ckupload/files/39695996016.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b662f22f4c---vejotorolisaminibutejidiw.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/xolokafisalasisefowe.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/22535849003.pdfIn PDF document text
    • https://computerzone.pk/file/woxunakodoveribij.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/nujobo.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nefigujered.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=maria+montessori+theory+summaryPDF 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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 17900 bytes
SHA-256: bb2edc120ce8bc5011ccd0308a5f77c3037dafd804da867f7e0c6b6e12f2e921
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10532 bytes
SHA-256: 0b398fdd607f2b9915de3bfeb3ef712b7e92a9ea84578797af60621819ee4faf

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