Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bbcf7cfc112e7a…

MALICIOUS

PDF

94.9 KB Created: 2021-07-04 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 45b0eab03a1d1c4ff178a3dbf0d04db0 SHA-1: fef3f1b647f483709ebaedb80a1fa80881aa2fc5 SHA-256: b9bbcf7cfc112e7a0b92f924a8d665110f5b5a39f1de1856aea369613e1ad454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest an attempt to lure users to external sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=harry+styles+band+guitarist PDF link annotation
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a2a2eb89a392i26vs98euj0ias/julitotudotizopev.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/todugapawaxeloxo.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/11594607990.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/95174263682.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dusazazugijijedimasu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdfa32e93---51523839336.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5dafd0bdd---30079826901.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gedorizo.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/79817801882.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/69112050343.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7c8ef14b---lakusiz.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/32410285268.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/14f27df891412214b5d3fbe0f717c338/46711427248.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb437194f---nuxaniroxepurepasiri.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xezovixoditovetorenav.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c6bf2364---temadeworowirowafenarixon.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cda19074886---56683612731.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/milorivomekosuromutugeba.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b6487f5de9a1c44be92b4b5b58b9708/vegapakamesu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4258def3167b3b9e25e00758bf7600d7/lanomiveboxegito.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/jowibukosokolugave.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6500a804b3---30902155407.pdfIn PDF document text
    • https://aspirans.com/files/file/jokepe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16093b515d9970---85092678040.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/812197b1c03673da0ad95cd8dba49d99/molewejefikatuzolo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/80598335145.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/76b832699c7995854a4d7f293d54a375/wurudeniporuzov.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_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10648 bytes
SHA-256: 019081fdda09e4df82180d3e5e2d61f907d0045c02f3d7257dc2949c33b31fb6
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 18020 bytes
SHA-256: a2b8c8b83f46de67889d537da5998ff80b6af353dc92923b1abb212feebbea87
font_02_sfnt_off000154b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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