Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43fbde8ec8d4c55…

MALICIOUS

PDF

91.5 KB Created: 2021-08-01 23:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2532e3aa270180c2733e437638a6ed66 SHA-1: 5d244ffc26f1a229b9e03a0b30b103bc3435ca32 SHA-256: e43fbde8ec8d4c55f20733643b16727882f084aba16a2656e8da7dfc5026246c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bg8ldk4us7iomfn04n919gna3o/39646714923.pdf
    • http://poltinik.ru/userfiles/file/lopomosidatowulanetosito.pdf
    • https://contabil-fiscal.ro/mm/file/95178505858.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bovigaguk.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pmt4sl4hmk6s80mknn13g5drlp/49760354636.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/75214ab8d5d6339ca7aff1189029bb0f/76330801320.pdf
    • http://j-club.eu/userfiles/file/19522023699.pdf
    • http://jongauger.com/userfiles/file/39603354748.pdf
    • https://ludifrance.fr/userfiles/file/kegowek.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae08323ad---48046638476.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7fce680533e1018079b278969faae036/30638408731.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/mojiwuxofewanasaniwewosi.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/721f0ca6e4fc9d8c353e0b1d1d6d10f6/26738062941.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c892fcaf45c60ad708b9b4a369ccea8d/sumalixagaribefulukowiga.pdf
    • http://podhoru.cz/userfiles/file/48828253561.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080e471abd42---xolizoze.pdf
    • http://lhsclassof68.com/clients/73441/File/61974825069.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amq5obfrbh7mmhf5kpii2kimp3/72619016790.pdf
    • http://jun-travel.com/userfiles/file/zovarolenewe.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafd8f1105---ritivedapuzudop.pdf
    • https://togeltop.net/contents//files/43885026218.pdf
    • https://synodradomski.pl/userfiles/file/22467333793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=notice+chaudi%C3%A8re+fioul+de+dietrich+gt+120
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 16792 bytes
font_01_sfnt_off000114a1.bin
0179e13679c61d79a74567f5a05003a962554ff8969fabc21959dc96d1dbc083
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 18856 bytes
font_02_sfnt_off0001445a.bin
e16308cc4f599670081ec3c8b2792b91f850c5d5efd926e310b10b11039c27ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1445A 11012 bytes