Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c6d957b19df41b…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 02:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e3a885a90390d98fa779ff5bc4a5625 SHA-1: 9aaeee300ce4dfeacb3cb0f2193baa97d566f8ca SHA-256: c1c6d957b19df41bda1691d15cc30570a8574ca93f453d4d705c784be905a957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/nisokekazupovofa.pdf In PDF document text
    • http://www.toeterloeh44.de/files/7777717951.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/38778168652.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/vogisagivefanavuta.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0e60daa6---bikudizu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wisijodibazimiti.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3ae0lg2nbm67t2ijgrf9c5f1h3/22603510076.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6lo0heo3cmu6mo5l5cj9gbjr9v/manedawuzepem.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/31446610094.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/lovuzefer.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a1c5bacc---nadakabuwinira.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-3/20210603163814491331.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/96471379183.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087500535695---83569936868.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/tuseluxogifepuxuxukodif.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/64776877823.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/58153076300.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/magefopewefon.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f352612e---lasem.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/24425120544.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/zijuluvesuz.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zagizanupedegimekoge.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/65396e88828985c340a7cd95092e0fe3/36940280023.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a9540dfcd---tazur.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d048e0d618---dolitagafen.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/15843820209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+solubility+curves+showPDF 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_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 17800 bytes
SHA-256: b1e851214a9521ee6a4db57f0911fe004f957117169066f97d34dc39f86933ba
font_01_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 10860 bytes
SHA-256: 19e24ef2ec4e704d48a6c7011e2148ed538e33204147e0445a1aec3f6bef8203

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