Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f621dfa979c0d63…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 00:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84c1fad42bf2bc121646169f33c26da1 SHA-1: 51412fb5b1c65e8eff98af76152248f44d43eb92 SHA-256: 2f621dfa979c0d636d56025bb1f6ae4e8335705bef20fc2df9428206f2f266e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple external URIs and a link farm structure indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=definition+for+colonisation PDF link annotation
    • https://csmgh.net/pevron/www/img/file/rinowalomukigubobu.pdfIn PDF document text
    • https://fuoriscena.eu/file/38676657066.pdfIn PDF document text
    • http://tai-group.com/upload/files/vorerabor.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/38944467593.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wolegizik.pdfIn PDF document text
    • http://livestocktool.com/d/files/winisilofajaw.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/logezelofalofazififexaw.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/mofajupefiketur.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sqq3kq8l6pg7mjhlkkep9blpo0/36818205923.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/fojaxe.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe928744a---xubedomuzazozatifakejoro.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ffea3e90c---dusigaweb.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/sivapuzutavu.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/14680655969.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60451655230.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/xupibe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0hjpn6bi9nn53sad211g6g36qd/31445619699.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gikev.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614755bba16cc---pibidakadigobu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/toronasalijos.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/nefofekozezuta.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20211004055552.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/45128773130.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/30305751720.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51401998184.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9820ea065---88169489170.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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 10332 bytes
SHA-256: 86fc8d56e2f28d14e3163995eb4ac50f1b613a94574e383737401448052452e2
font_01_sfnt_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 14640 bytes
SHA-256: 46d2af368cacf22e9278e2e8dff43a6c15227a20cfad0b9f9a25c2db4886dd21
font_02_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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