Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec249d0b0fd91d01…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ed4ce3ad3803f140e7b6b5e6453da2f SHA-1: b4427c4683ab6eca8b5a85ecebc529f3ca1c898c SHA-256: ec249d0b0fd91d017686b72ecb6e992fd1f98da9482b5973a7fc11c8ee7e7e34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=formation+of+ammonium PDF link annotation
    • http://notar-frings.de/userfiles/file/xubis.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/56041047389.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/xeligegaxitibusitukuneg.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/37883285536.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168f64f37f---zaroto.pdfIn PDF document text
    • http://i-physiology.ru/upload/48086330193.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53852855614.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/19110952603.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614153ec0358a---77674318764.pdfIn PDF document text
    • http://bubb.cn/up_file/file/jejoguliguzike.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/q7nd36eiu8jsr195iap37ul6cs/56856364092.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60324999059.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914143318.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/gobaro.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rupanopumivozizere.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/9014188844.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/60508936294.pdfIn PDF document text
    • http://autodilygood.cz/files/file/jipojadawozerimexup.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916040306744664.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/53715254946.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7e720c46---63610764150.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/dageridazajixemudiwobir.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/8076849403.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/33324457423.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1fa3e93dab94e48669ff047089cae92c/zifunugi.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10108 bytes
SHA-256: 93c90c3e037cd3515573e5f5a40871673bf8bf7df97f908756d03dba61bf016f
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 18492 bytes
SHA-256: 7ed39ace0a33a8d1cafe316f2f8b856fe148ceeb8862674390e32c22e5ba5a9d
font_02_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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