Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4033d65030230d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 07:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cc28f6d7f79920ddccaf280baa3956d SHA-1: 529bffcefab25f2480f1199c2f0c3ebc95019143 SHA-256: be4033d65030230d4c0c86ce328f9a65a793a545ae1a66e0bad4c6177e29ca3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=solid+ovarian+tumor+pdf PDF link annotation
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7c010f02---mudava.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dffacdfac---95314762859.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/45893042736.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527010009.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873af55ffd7---48060828094.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed8d88a2b---97456594672.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e865bd92f5---sivajedajivinemagu.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/88962242100.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gis26rbsvhv2kpverq41893tc0/22969625332.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/nukufapuvafupukigoxibukag.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mojujowifeta.pdfIn PDF document text
    • https://peterdegendt.be/file/nozamagebowunisazofofeno.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/416cb92e7498392c6e0c1ba56ca743a1/54677840922.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/gogudowajaniwuweji.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/peroxepule.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e8e278cb27409216d563b9158382d409/91974847495.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/52735456981.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cbc8e14e849f2290f9a5dd76b0003845/36340469938.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/pepotidagidife.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/xepujibegakediwo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/iggncpia6flh6npci4t4f9kcf0/75728853481.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059808a78f---vakaxozazamabiparex.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64a83b5a91---91951208833.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mibovapipodug.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf63b054be---6027438101.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/73010184022.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 15780 bytes
SHA-256: 2f80f10be86fcfa7723b0c6f3ab94ed114962bb117469c365feec0867966c04b
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 10600 bytes
SHA-256: 411e46f3c560128a95c4533b2f995242916a0c8e8627286050963de9c9946d89
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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