Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7a8a99210b7333…

MALICIOUS

PDF

85.7 KB Created: 2021-08-07 02:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 072bbed9e0e2c86ebac169a32468e986 SHA-1: 0022b485141a64426201ec367df4eb8322eb317a SHA-256: cc7a8a99210b7333cdf0be99c6d0bf1b7e2d66980ba894888c0682c178aa1fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=extension+de+hombro+musculos+agonistas+antagonistas+y+sinergistas PDF link annotation
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wifutez.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/wurativunibonimawoweg.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/bapudepiluw.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/80733244777.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2jt43ms5ek23v30tumih6siqk4/pujopisojemidowis.pdfIn PDF document text
    • https://shopabrang.com/images/files/xowopasur.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160750134acb22---xejasete.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/rezuwozitinixututigo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/melobifamapajaviduzaso.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lbdmmdn3dq5lbm2stiq618v041/kufuziramurejuxip.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/jomirasewegoruvibesoxiba.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4467aa1f5---titadajamekalejazoju.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608101a29df57---33719106932.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/35671099409.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rawisawogixabigupetaf.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/98572434840.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e75ef4d0089---kazodurisebezoratinetab.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/95854305884.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/18457013461.pdfIn PDF document text
    • https://grnca.org/img/files/files/lolinijozumutog.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/71559983232.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dekugewebisa.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f7129af546e57ddf7f1a9919b46a3b5a/68278990603.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/6369128137.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160710f4db5f0b---bibinani.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f30dd3dce---20635080651.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce8cfa772a52547ca2d4b158c68a47c9/34374099529.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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 18000 bytes
SHA-256: b05f7f49e5676f4cda6b04580a7420f5b04aa575e8a10e9a8ee3212d3da6f962
font_02_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 11256 bytes
SHA-256: 5041b97a4e450787700ac7334ba02c65bc9f08b713cff85e7966f36a75d85672

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