Malicious PDF — malware analysis report

Static analysis result for SHA-256 476b46f4359f47e5…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 01:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7e085201ee4c3b5ead65098c5a814ee SHA-1: b07094f67245502b0bf4194372c3c017ca5633b8 SHA-256: 476b46f4359f47e573f0e4c32ec49cfd3b9f45245b40564813ad9fe1642edfa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the overall structure point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=spanish+sword+and+buckler PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/24615445871.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/98598655101.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/27496638009.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7f42538048666e2777a7af3c0e2bc900/69097733524.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/55506477960.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/23114921581.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/074d68880a869f56bee2d7e09e12054e/zikakemijedepuwajuzagexun.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76fc0ab4d---nasunufobumelifuritada.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/73384252497.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789d5377575---boboseratalufofu.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/720ad232a045ed9562db4cc9c3738ae1/bulebuxugiwupu.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/sozaku.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/tagoz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c1ceec88f---97328859851.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/67207590361.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bunaxugizapegamofuw.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/81807275494.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/pijonidozi.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/72513878139.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/wafawofutevilozid.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/add2c0f166647a587ca9fae6b154ec10/53878101364.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cf2201fb---7326049635.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/47527506320.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/84314327518.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/57763533957.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_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 19636 bytes
SHA-256: 64ddfe2b4d65b983237f38e3462de5896b039dcaaf9871c692ffdb609c9d9fcf
font_01_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 11004 bytes
SHA-256: 292a0acf63055b77ed9ee44f1da4a83c572e83759148342525e4664dbef7ae36

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