Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1b421d4a34cda0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3af9294acd5f40ff14bb68250b68fc10 SHA-1: a0e285c08fdefbf504b71b45147dfc9a08ca7695 SHA-256: ce1b421d4a34cda0125bce03a94213952a58d8e944c4754fea23a07277224e60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No specific script actions were clearly discernible beyond the presence of JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=denouement+meaning+in+telugu PDF link annotation
    • http://www.primariasantana.ro/uploads/file/wogojesi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/4461651292.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c168ede33b5078dbc18418c9f2af6e89/28456038681.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/82432318021.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/26682747242.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/zagibaf.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/38640834461.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/19hefg533n713fa6puhl0pous6/43974379852.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2704583826e9f87c765493c5a8cc293b/85453418461.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ga7cblmhmmp8787k7ggr2dr8u9/benorojolonuxunorevibiba.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2ea8d2a8---juwer.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e788e213435---gotemoloforuvuvujekute.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/be9c193278ed4308cb041f3b181df385/23574905633.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/15234329158.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/jinopikakabuzipekajaluf.pdfIn PDF document text
    • http://jucal.es/images/file/sigalobiwatidobexomaxefez.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20592e334---jugisedogiwulaguvovotite.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/seposidubisisir.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/suxidelixuzolugil.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1dadfdaab574f75780709b5e641474ee/18772005652.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210805_C8B5108CD861CE8D.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c678c3db---lutofesagur.pdfIn PDF document text
    • https://sinarwaja.com/account/files/vukowofakefidagele.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/89110884500.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_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 21052 bytes
SHA-256: 418de04b12578d00e9d90802a2228a33337ebe00765c7c8b10f723e3df07c073
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 10284 bytes
SHA-256: 769083cdf845c87138bf038b0b0d3f0fcba31518109bab33e908e6ef23dde980

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