Malicious PDF — malware analysis report

Static analysis result for SHA-256 159338e3d19de96a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 18:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f806d50dbea73290f167ad6951359aa SHA-1: bfb2c74d2fc102fe05199fb71e236664419f96a1 SHA-256: 159338e3d19de96a737e1ae45b2cacb4d334df94f33a892633853fb1b467df22
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The document's structure and URL patterns are consistent with SEO-poisoning techniques used to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://monterroso-construpuntos.com/campannas/file/wadoku.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///56697598035.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f977e08b875---fomapulajufilenake.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/21606526922.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/26676748761.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120ccfa897fd---vuviteda.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072332e3b36a---92190743460.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/zexupoxinugosewusasel.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/65749897501.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/retodarokexinupijujakebon.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f049e7b3b15---zefalup.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/xaribojemo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/22ed79d327f60398a603d1b65725ee1c/genibiboxuso.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1g0eth7acfi3cjvngr5ph6jj80/98913146626.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/7919413683.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/f3118230868bd9d9453e417dc903b395/xifopegujuwuxofevu.pdfIn PDF document text
    • http://primaneighbors.com/userimages/51936058398.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb181260758---faxisij.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e71f87f17---17917374217.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/a4jn14eqt1cknhv1jpq2shrlbu/jovilemitinebemafo.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/24556106135.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ik757ffg42scq6pvl9tbgt1ikq/12407260490.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ee49496b---samerelomagiwujoj.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/telunovesamogarapamuxebu.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051709215773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=freelander+parts+manualPDF 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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 10420 bytes
SHA-256: 317715a62f2cae0bcfb3fb938c03a8b5af06ad66b734b34cb06e61855ee25700
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 17228 bytes
SHA-256: 24b0860e427f9f9739cc82170e43f54198fb64adb75e9c327d55004c8d015b82
font_02_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1