Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9773cb6c989be41…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 22:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5571465590e0f8bce080b71aee3a60c8 SHA-1: 5d0bf063217acd6261c58271f771748021416d60 SHA-256: c9773cb6c989be418a45d023f6f9f082c0cde627da578d8ed755088528f1e6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. No scripts were extracted, but the presence of external URIs and link farms indicates a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=installing+custom+rom+on+android PDF link annotation
    • http://architettodrabeni.it/userfiles/files/papogurekewokuzaw.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109050802205022276vkjs.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0928af5ed6e89f78b50fc7f30462e26/30683564178.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e509e543d---janonowodofozo.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/17261266230.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48950d4b9---labigobudazak.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/39089252317.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/71211989058.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gerakagosoresilame.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nederu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf900613b---rarovol.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/niteguxuwubesososagovegif.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tezifurapej.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/nokijusavifak.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e11fedbc20dc8dc45788f654693878a/vewapamijozomoxona.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abaabcc42f---xenulumolabez.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/14548344343.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/59221387802.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/57578510177.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/gokitaj.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/93677444295.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/59594344181.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/43066642183.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/85938778303.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10632 bytes
SHA-256: a7db6718d043f455547f946d02becec1f7304273723cdb2a276cca8e81a0c79e
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 18532 bytes
SHA-256: 257fc58d4165a72d49b88159d3b9c25d326164d61b3e7ac0eb34458431081914

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