Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac404b9df70121ab…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 12:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f0dfe9cef5b3b4d25b452b18599322b SHA-1: 4ab7ca688966ef89f64f2dc34ad6940aeda7d811 SHA-256: ac404b9df70121abb0242200441140da795b4f8146855cff11929dd77f52b73f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=social+responsiveness+scale+for+adults PDF link annotation
    • http://fzcce.com/aimgs/uload/files/kefugewobaziz.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/63166584805.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/pofuxenisekelimin.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4efeb254902dce6eed5725eeae318e89/wavutenerap.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3ae9a47c---vewokezopesofomavu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/setixofegara.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/51425155928.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c443532e---povatoxafavexurunef.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/93231640014.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/60316197042c3d3902255adde784f157/11867012124.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/69124872156.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084bae4f3200---gumemosewaravufoda.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b833b872b8---9586132424.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gejagosa.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/xatizilezuxobelili.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/16jm1thitn75onbefk6o45dv1e/somogifipixinidokadune.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5ef5ce5e283844470108cfc8953abfb1/74313010748.pdfIn PDF document text
    • http://kbchina.de/upload/29884488526.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a00877f9e---26714545230.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/pasapabubimekigewejafuneb.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/67627163402.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd900eeaac---samujanutu.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/15503afc588f11d68daacd597ad2a404/diweg.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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 15892 bytes
SHA-256: 455680bcb1dd3b2b00a1809d0fc6e8e599e4fb9e4420d7ce6cdb2c8bf65f519a
font_02_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 10856 bytes
SHA-256: ff791a82ed1bb6bd1b382c87b0eab1d651fe859bc6022ba8d46ce98bc60556c2

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