Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02512effd9dbe9d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-24 09:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7b9751d35153a35edab227aaad4ed6b SHA-1: cc56303d665930b4a8ea43fc42c57373a4d11ac6 SHA-256: c02512effd9dbe9d1ab6337caf5a98a9dd242def8ac72216196b714d93faaaf8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic firings indicate a link farm strategy, likely intended to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=android+phone+hack+apps
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b1d07a98992d197719149159638a25e5/36938967055.pdf
    • http://massageindex.nl/images/uploads/xolojifazerukadidor.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/77343720834.pdf
    • https://www.pharmawell.eu/ckfinder/userfiles/files/22241712744.pdf
    • https://brukspec.pl/upload/file/savogud.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149f85599c6a---vakazepejokitimal.pdf
    • http://diagnosticaedilizia.com/userfiles/files/58196270358.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/8675435476.pdf
    • https://digbijoynath.in/uploads/userfiles/files/65580587163.pdf
    • https://yourwebcenter.com/files/file/ripulur.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f5c6c628---94988851265.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/zikupanoxulorutezimupazad.pdf
    • http://ultraljud.nu/bild/files/wexodajufokif.pdf
    • http://hueide.com/upload/files/dopenudifoberejuzenogowab.pdf
    • http://sotel-perm.ru/site/file/zedibag.pdf
    • https://gangnampools.com/contents/files/1347094533.pdf
    • http://studiosantomauro.it/userfiles/files/41925768892.pdf
    • http://nontaromclinic.com/ckfinder/userfiles/files/2905286015.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jidupubufolavifoje.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/fesanuduwolejawedufe.pdf
    • http://intertexmedical.com/userfiles/files/kozoranike.pdf
    • https://manhremhoangvan.com/wp-content/uploads/files/tifopozexozukavofow.pdf
    • http://itexpertdog.nwoasis.com/upload/files/36324144650.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ddc3c5d7ae15727caf1c2cdc057a9a3f/kedevineviwinetazowulit.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80c99ec00---joxoferowitobufivif.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345a98233a8---monad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16792 bytes
font_01_sfnt_off0001058d.bin
f42109124ae72f69ac1152be25490d96997f3e624050ba7a31545ca79daf50fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 17564 bytes
font_02_sfnt_off00013351.bin
f20267395f353e69718f2a1d73bc67ad7e362199cf26aa7db2a5397e7f87a063
pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 10540 bytes