Malicious PDF — malware analysis report

Static analysis result for SHA-256 288ff208f159b759…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 08:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7686cbc8fc9d8073cfa1870ed7a21cdc SHA-1: 56be28ff17c107f91419cfc5d66bd63610497360 SHA-256: 288ff208f159b75924617c6f67e5f9735d6630971ad5a68892c37f391123fe72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=archangel+for+anxiety PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e9e32a2491b8b2e0315f0e258c38d60/54272448002.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/92684765607.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kejirebaroketip.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/286285480.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/77064260703.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d49c91aad---katasemegetibagepatelip.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cde3de338da6de873bcb8c19c474e61f/fanepi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e607091a7---37710405842.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/movuduzogufawesemizubem.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/afe02c667504cb4180566a1d6e37eeee/setit.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/13g5lph3gkotj8eu1ht4kn5al4/48109117472.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/98a93f33b635a2aa4fc898d9fcd64f68/mojonogagejanuxafawawalis.pdfIn PDF document text
    • https://aspirans.com/files/file/18449536843.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kagapafozojebabexuvob.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/fokap.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fupojed.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/37375229576.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/lusexonulazukodisulid.pdfIn PDF document text
    • https://tavio.ru/files/file/63815866821.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20dacc805---kitexegefezekibalona.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/19464241207.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9329628b0---kimusiza.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/vegodomizejixudo.pdfIn PDF document text
    • 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_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10644 bytes
SHA-256: 38d463dd41bab3cd72cde916734092383c60583817229182053e5af04eb0cf1c
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 16924 bytes
SHA-256: fc9e545325b6ecd856b25cd343280eee4c8077ba2fb0ee23c0ac2358ffa6b0a6
font_02_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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