Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9a8ecdee090c70…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 08:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 11b761bfbf37bbdef44202d5318b11e3 SHA-1: 7298b010a2616b322e3902eb02dfe9e1e0b2242a SHA-256: 0b9a8ecdee090c70f54a45defc70e8f6f81668a34366ec7bd3cab77e824b6eaf
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDFs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=preposition+worksheet+for+class+6+with+answers PDF link annotation
    • http://cathugo-yachts.de/res/wysiwyg/file/42300974680.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rexagusut.pdfIn PDF document text
    • http://emeat.ru/var/files/ranoxowugedanov.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902085404.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zepitezukomumu.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/42371624100.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/52765550896.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83264616183.pdfIn PDF document text
    • http://space-edge.com/upload/files/biwarugelif.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134c21c05683---vojitirisa.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/navuf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/91025b39152ba74714b0f93cdd70751b/suzigowanijawabetegij.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xedujotebirelinuja.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14091663430.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210909150552.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/nimekuzofori.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/jodutafosebexugaw.pdfIn PDF document text
    • https://lorus.rs/files/69299005504.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613634f544f35---togobotikizokibuvelabobum.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/buzevukelikinokijukolegan.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17408793074.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/3272157245.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140256cbf573---fujaz.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_off0000c09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09D 10924 bytes
SHA-256: bec09ab9ea106614e3b50f2d3d979fda2e513539ff0cd4c596422a1b353268b2
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 17380 bytes
SHA-256: 4ddecf8c15b0d76d1db49c63db67137ab075796ed9308067e75f944f09bb9a7b
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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