Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd1c4323f1ba3cd…

MALICIOUS

PDF

85.9 KB Created: 2021-08-06 05:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16b955f61c374792f170ff30cee862e9 SHA-1: 2b3788520de0a2d373f2710a838e840c17e67b1c SHA-256: 4cd1c4323f1ba3cdae944958a9ff141599ac1fcb917ddde8a1502c50b596b5a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7161

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=ap+world+leq+example PDF link annotation
    • https://renesens21.com/ressources/upload/files/91806722967.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/175bf6f3e40ddd205fadffc73b42f294/kiwebevugeniximanuga.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pedesirudekirogupu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e4rbcp4olork9rj6fkglbbbra3/mekifufapobuvekepa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8mvs3isgji49inhvuc57sgqd0h/8125508467.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11b00fa97---vobirovizadenubuw.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/nijezizozuzu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/73623858557.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/movipaburol.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/49fc0f3a5980edf871884251a6390815/79183781253.pdfIn PDF document text
    • http://khocabien.com/uploads/files/88924740102.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4c235ed1---gagoz.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/s8igss1aa1vv2fhbe3eidigm66/30369722265.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b9d3268c3cef0ecd67433ae29ec58c1a/29691655779.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/zetevupud.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aada68249b3---nuwanusubibikepevuna.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143d899b28---43368339921.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/lefapigu.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/purapuwinosufovutekojuw.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/fepamatonemix.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8ce3eb37---fezepamilig.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086755c24066---jazivufabuxijuxepoxiko.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091c80eec00b---golenibo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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