Malicious PDF — malware analysis report

Static analysis result for SHA-256 6843861abd317d9e…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 10:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9394477a967fc4a73dac963f23ca5ac SHA-1: d79ba46a1261a305a8da7ff916231ffe81208606 SHA-256: 6843861abd317d9ee9ba5e468bf6fd9fa6191ec37cb2f15981af4d9d5b39a186
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of link farms on compromised CMS uploads is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=how+to+read+departure+charts PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607854a5eea16---razanixekisetejexelaxaren.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/20733949038.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/41014407301.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rmj01pfg1693rqftpe5m7fq2bd/kazunutepuzawofebed.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///29065515993.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/zolup.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vuwikobegoze.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/904509fc9d16fa0adfd0c73135e83d75/13377199533.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/27272f8fe3cc627e3c02859afddd2c9b/53163203909.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/zipebe.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/lepakonuwomuru.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/sidilekajufulenelov.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1c6c0948---dekijoteb.pdfIn PDF document text
    • https://mmszke.hu/files/file/wubomefopexikululaxefowib.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/luseronesaburewejap.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/991e582115d4f7cbe962a00d53a740b0/depanoxirepirufoku.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5856bb24a8---wolusiteruxadovixiwojete.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba32b67b52---badunepevelifilafup.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/36902051600.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/44225239281.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/babunobawefebalitukawiloz.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/60fb195b51a144a031f9d62efc1cb4ea/nedigozikox.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fasokabegusudokaf.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e78904c2ac---35033149154.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/gifukenobovesowadotuwa.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_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 17588 bytes
SHA-256: ac484174638d2aaebbec1064d7da0b48b184eb0feac533d4e42c66af01c51451
font_01_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 10544 bytes
SHA-256: 717d54b813fd0a51a819b251d84e5f4ba70de6454628bc02cc97b8b18a836f11

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