Malicious PDF — malware analysis report

Static analysis result for SHA-256 23db369c007b8c97…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 09:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0210c1a12ad89b20962ccd3bf6481c02 SHA-1: b6cab9bb713b4f929c9d088da8b787341787af8e SHA-256: 23db369c007b8c972087a6846c1cd6adbff2ccae4344ca0ebdc582df2381cf1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160947c31b66e0---dukejexuxiki.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/62193542578.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/69187412973.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/kabinaputufobuduxexojigil.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/talopak.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7054545914---subewemedadijofirorol.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/davefamipuzezatul.pdfIn PDF document text
    • http://vhshf.de/File/bipokav.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b821df876---43423396335.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/cd058e61148c043533d2be3cfcda3313/waxadazelezotuxivilefir.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/93476449834.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/ratudosuwunuk.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fesewidinujajibi.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021082112315673499.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/rixusesazolomigijuku.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gse8nn9sju2bm55a385ui37393/vijemolewolifozub.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f38db5a9---weritozolakepisunule.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4bceefdc---41154177585.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/17632876831.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0f516ed3---zamesipumubafenogageput.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kimusazisasetetanamexet.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/gapapiwumivek.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/jexuzasi.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/21971672461.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202108101503017717.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/va3d6ud57vf28r43k6fkvv73c4/59202814725.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609877c2065dd---77578502771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chest+infection+no+feverPDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 17276 bytes
SHA-256: c13491a79d4e66d4e2116737e2345e79f40347efef170b4ac5885a6fd7ce6fd2
font_02_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 10324 bytes
SHA-256: fd3670902014bb626a27239c7239c341e3ab4d7796579d04396389c01063f1c0

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