Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdc025c2a904d61…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 00:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bc8c187225e0d5e327b695e91964ce6 SHA-1: d41b77e735becc86779da559b02509c1b77a8c4a SHA-256: 9cdc025c2a904d615424bd950db0916b19d87844904a44e97b5480d471f2d8be
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. Additionally, numerous URLs were extracted, many of which point to compromised websites or disposable hosting, forming a link farm. These elements strongly suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://laborke.ru/uplcv?utm_term=teaching+by+principles+an+interactive+approach+to+language+pedagogy+2nd+edition PDF link annotation
    • http://www.petercar0937494634.com/upload/img/files/18325720312.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131479850efd---seveve.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/10/xufifotof.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/86755168369.pdfIn PDF document text
    • http://santabruna.cl/upload/file/26778161581.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/56313bd29b6633ab5d906081cb342665/jazogo.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fofibifakirekiwoj.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/menazasunutupekusoz.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210908_070010.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/jupabelojaje.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/belemiwofulunobewijezake.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/zokowonubedug.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/furobozugebaduxezipa.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/7883453486.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/52993339325.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39918205854.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/laxakajuberifadag.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/71387469876.pdfIn PDF document text
    • http://air-con.ru/upload/files/14341288743.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/14490576015.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614674c5957b3---78507492972.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/86365676065.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/44176677653.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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 11296 bytes
SHA-256: c205bc36200d6d678aa42aa1ed7d13843bbbddf9410073ce61ad5a56cec64590
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16544 bytes
SHA-256: e68b67dcd640c862d5be69e714be570948f0d76a8ada690f8ac9f02d1ac18ce7

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