Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef75d0391ee1d2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 05:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eae11894200767b6a3e2bf2b8345fc0a SHA-1: 796a96859c866dfcd899283a398110125e94a15c SHA-256: d4ef75d0391ee1d288997400b00ad003506a3cacb582bc1da0d8cfc76e3d9a47
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aymexco.ro/ckfinder/userfiles/files/gikikaf.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ab61c24bacb84c5deebd3683b07811ce/43075050916.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/bumamifomuduborefo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd14bb262---felatojolusuzafusuki.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31411954528.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52ef4d6aad---51794471817.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4db75853---kiwonerewusefatijiv.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/gixegilibilolimex.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/ropamexiwilusegopimovu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4874b10c---fepovidefemunexibed.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zixad.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v897a6b1u18nmbifleqo78csj7/pizefe.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/pejatonulivabu.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/84662979646.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nefosorigozadujerinokumas.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/disojokizisop.pdfIn PDF document text
    • https://unosms.us/userfiles/file/53410846315.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085562da43f4---bogulemodikuwebek.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b72c3ef7f55c5b53503feb19f1a4fa5/lurobot.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713c74a5a8a---losogozijigeraradinogugi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c7d3d0bbb---rulijidoxigovi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/79345452929.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef7121f742---bewadeletapeb.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9da7b8aa9ba8a1c9d8d8e85fc8b0a1a9/76636426292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+gta+5+android+without+verificationPDF 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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 10964 bytes
SHA-256: beca47428eb80cbbd73cec66a452ec659241a5968681dc0c3e39783fd71ccef8
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 16436 bytes
SHA-256: f4704e9fb63fd69376254ffded9d744c99b1029627f5511e1a04d6ce9f2b3fed
font_02_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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