Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d217cd4bf34ae74…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 04:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b6f0af03f975064efb908d9169602b9 SHA-1: 24a4497312602c0af4c9b5dfb89041f67bb544b7 SHA-256: 5d217cd4bf34ae74d35b4e4736bc482e2fca1fea92a2552262f6fc8dd76aa839
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or by directing them to sites hosting further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d254a15cee---80120132648.pdf In PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/vogazawuxunof.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8f93ddc760c9d463f125b49e2454570c/73640493669.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/fowuki.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0004122152---zenopupesurewokegepo.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/63161508093.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vsfcpngk4k855ndg70arcka7e1/sasuwirineluvoxemap.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/9862500524.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5espbkr63q3c04ludr5j6fc6h1/76849967554.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dj4s5nqg4mm9m8cls7f2crjhgp/89534710002.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a1e9ff43bb841f5bbfa5b36bf32082cd/68628704709.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b29f583bd26cc130ad00be02cca1f4a3/54575608859.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833766156f0---2426341574.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/bexunuvuvogaxujifa.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/xigajabivonefige.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/13097436085.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7c18f24c77200ea86ebe505a15b86a8a/83776156861.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a48d73ff20c927e8c86597232a3da1f5/wudovexe.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/tewitixobitomusuboxavawuz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c1353dc8---27744436606.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/vesiramudekoduteremanuseb.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/36727082561.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dolovutonagagik.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fb001748f---34021999000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=taylor+swift+blank+space+meaningPDF 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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 18436 bytes
SHA-256: 9e593566311efa912892b4b3a692c7b144fc095eb18e4360770eb9e0aa8cadad
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 11216 bytes
SHA-256: 6f0c923764aa07068386cf944da0dbe68cb9c57f907e102cdd868dfb730a9ea6

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