Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e246b7bdafc7d4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 09:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4428c6cb34d71d26f004a90f64e36bea SHA-1: e1540d026753f221a6467779f30266224424ffdf SHA-256: 82e246b7bdafc7d4991b5fa0342e8e04463708cc8985f61b7de17f334962bb2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=how+to+paired+bluetooth+devices+in+android PDF link annotation
    • https://artedelvalle.cl/gal/files/file/1012022542.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/gigisa.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/mebugide.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/71208001770.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ratewijomuful.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/99706557965.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83667906202.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143180f8d125---766094663.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vokuvowuz.pdfIn PDF document text
    • https://mavibusiness.it/file/69812301677.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/27366868520.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/40568340494.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332adda170b---kisugibuwikiziruzomapiv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146884b23bd6---sokasos.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pojov.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea54d9a94---92723107990.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/pobudiwuvivabimibeguriwo.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/fadoma.pdfIn PDF document text
    • http://3sdent.com/upload/files/11043443823.pdfIn PDF document text
    • https://spacio.hk/attachment/file/deserokawunoxiziniluzegak.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/16814358414.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/46410602550.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/zadovodirijelarokexovupo.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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 18604 bytes
SHA-256: f6db614a3b4600b069ec3d0ec250e6b1e194eb773d3aa72eee2cbbacdf086968
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10996 bytes
SHA-256: 3d0387789300876a01f200bb8d34014398db93d718e836a6b75b43a221cfee7f
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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