Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dd4bb18f7a1faf…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d406413fe4cb87a2c43e66f45ac102a7 SHA-1: 32f6bfb1742ddd9232fe8ad87dfba34b4faf65b1 SHA-256: a9dd4bb18f7a1fafa882725060f8ba23411d944db84ed02994091567c2f51110
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress upload directories. The presence of 'utm_term' parameters suggests potential SEO manipulation or tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mezon.jp/userfiles/file/4394571948.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b6f0330380e9aff42c2b4c52513e7fa6/14086987354.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/31660666665.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vobolu.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/15915139877.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/xobozufalizanuwudelanad.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cb940d6a---88437196495.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/bfe3e49b8fce2b9064e9f282263c9202/63918466053.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/3038893559.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/3671344096.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/31784288828.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/gakorikun.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9376198ed50bdbe8e7e04841d59e0ac1/37700215564.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/64298174500.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750e558ca7e---dajipirigelujo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/nibepopakodajek.pdfIn PDF document text
    • http://blueyee.com/upload/file/170904195258.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20368210106.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/64on7ifqpoljrrmg928ndpl134/90031515218.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/pofawimifureguwefowefa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/7509301450.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89353783532.pdfIn PDF document text
    • http://esejsc.com/upload/files/47071808212.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/zegenegozene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=importancia+de+los+valores+sociales+pdfPDF 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 10800 bytes
SHA-256: bc1f1bc1a55582bbbb7e1e5bb07483bba7cc1d49355575dbddee707750d5b7c5
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 18740 bytes
SHA-256: 456fb1a923f569cd239e5c1971ae57af398151f3df5733b74525ba1200a09216
font_02_sfnt_off00013eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1