Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8625d6a9cfaa0e…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 17:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acc07fd074bd5fedbb2ed139b3efe72d SHA-1: 48a438cf581fad514f771ee51a60c76aead86b7b SHA-256: 7e8625d6a9cfaa0e5eecff9f6ebdea999edcf691345f68a6cfc98148d2321187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://goodfortune.hk/UpLoadFile/file///1077377474.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161333aec512db---mawigevawe.pdf
    • http://studiotecnicostradi.eu/userfiles/files/kijitaziwibubema.pdf
    • https://art-eria.pl/mandarynka/pliki/files/wusijedamozu.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/fagovamefazad.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/bikubisedudiwizet.pdf
    • https://narellesastro.com/userfiles/files/7822707870.pdf
    • http://traktorpulling.de/ablage/userfiles/files/47354204517.pdf
    • https://icon-studios.com/userfiles/file/76103562238.pdf
    • http://vietnam-intraco.com/webroot/img/files/51340893065.pdf
    • http://sambometal.com/dataroom/file/13860442453.pdf
    • http://dungculamdep.com/fckeditor_userfiles/file/vanoserubafipaguzakaja.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/50354553295.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/pugavesovoniwum.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e50dd3e8a5a8d7e6aa251462ea507389/15021903428.pdf
    • http://gesgo.de/userfiles/file/ruzefafuvakejitavamulabos.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/jixovafuwufigebosufer.pdf
    • https://leo.tw/upload/ckeditor/files/ditumadovezax.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/molipesariwepidunoxeni.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161556db306795---pimeridugofa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=stickman+legendary+mod+apk
    • 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_off0000ada7.bin
0d7e08059bcf2dae2ade62e27bc04933c35a4446f4d77a9b6d57e3b90ca6691a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADA7 15432 bytes
font_01_sfnt_off0000d514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 16792 bytes
font_02_sfnt_off0000ed2b.bin
fed121c59c8761369ae97272be83fce2e2e50651c4a724c1dce199fcbb145edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 10972 bytes

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