Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e13a27228731f1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 01:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6108f19de6957622dc816f76d4a98c7 SHA-1: 0783def2c913f3c3ed501222d02a585c26894997 SHA-256: f0e13a27228731f1343852474aabe70fd054f8054c0e2a19e6e3652b8c3deb15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=among+us+apk+free+pets+and+skins PDF link annotation
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/suveme.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/ziserox.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5ae3bc03e---79176981178.pdfIn PDF document text
    • https://asken.as/bilder/file/53913361300.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/65829479086.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210929_EF33FA60AEF2BBCC.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/bedolefetozi.pdfIn PDF document text
    • https://rintrans.com/files/metutefet.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/goguzilibukewodivim.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/badudemiwukidenaweri.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudegikowuvuvegizipiwib.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/83540635009.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/59414151213.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/vopufovudekibilusizopez.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/dibezomixi.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/45570779475.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3d4e3b27---lisekegunilidegomes.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/12612326367.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/lapuwijebarutavuse.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092815074660.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/78b558333330db0661383e5e5cf858fc/3837752705.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce9fa6add---22808866001.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_off0000b18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 17752 bytes
SHA-256: d7abc576cc4c34e2700ccdc8daf73d38b5bb27455c3f0910eb9835a86aa93ee4
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10968 bytes
SHA-256: b5adaffa001e42f76a9d5986c4364672057f823a4195389696a7d7198cc29251

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