Malicious PDF — malware analysis report

Static analysis result for SHA-256 d351f21f730ced0d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 02:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6baa8d00f61dbe4f30d1ff27f58bd66 SHA-1: f6cdd320104c76388e537f6a709291abd5b23844 SHA-256: d351f21f730ced0ddc6e26a4d5ff035fc489fbe7d110e7fe2635a511cacf76a1
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://habitat3.eu/userfiles/files/18825787486.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ggpb25dvbve7pgsbacpstpnhen/38587448553.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/25461771128.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b098198b6b---vavukonesisepizuti.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1978b37066---90024685716.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095a3e98992e---sokun.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/33844634000.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/36738276155.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/linodojiwadodisuxafapevo.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/56825142431.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6adcac59c203fa1f4ce1091e667746a1/luvufu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zepagowipumole.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xorujuza.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/sinul.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/59a8d1f809cdbc5767f87fcef3c898af/juxomiroruxivujiluf.pdfIn PDF document text
    • https://ambalatender.com/upload/files/45825952299.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad565f99483---86521636593.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/basafugunolewevawasi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/jujeseseso.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41bf349d6---weguxizugixa.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/bbumqvbfe9bv5oq15ggrskrp17/36146505311.pdfIn PDF document text
    • https://ienter.bg/files/givetegudezire.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e8e6a74e---4116443225.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/78291086999.pdfIn PDF document text
    • http://4bx.pl/public/file/xawiwowivawexipeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mitraclip+abbott+pdfPDF link annotation
    • 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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 17384 bytes
SHA-256: 1dceaed5ae3eb7150631d59ab5245ebb860390ad9850eed62487c68a743ffa1f
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10344 bytes
SHA-256: 43371742a57d0040e7e7f88865ce6c0d31170ba5d14a3545fe7c7a76af633f84
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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