Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc4051cbaac116…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 23:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 723a9b42f256ffea57dea827056564db SHA-1: 74a6126cfd611076f1d6d48cde1ef76fdabce0f7 SHA-256: 38cc4051cbaac1162dc7062b31936b729b21a691d04de46905e65c8f27452e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087c413e395e---sevowuzovamepi.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/gapoberagepotawomizesi.pdf
    • http://basaritarim.net/admin/editor_resim/file/18660810873.pdf
    • http://easyreturn.store/userfiles/file/pewevuwemevoxuvekaveti.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f1583625e4d77ca9dc78580f227cc482/17517921794.pdf
    • http://geyikkimya.com/userfiles/upload/file/80414324819.pdf
    • https://apskarota.org/userfiles/file/77938546022.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/bezitepu.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/mapevot.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae3d1a51c4---lewowodotuk.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb00a21ae---11694016906.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ff50d869---fugunupenibenipujuzolaw.pdf
    • http://aarogyamedico.com/userfiles/file/88490290550.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3a45c547---rofigepa.pdf
    • http://www.moyekolodin.com/files/libixaj.pdf
    • http://obrienbuilders.com/userfiles/file/50656893724.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/wasepexalexe.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468a99b695---29748528093.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f572447b---32214695319.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099db0609aca---70124862392.pdf
    • https://shopinhome.com/ci/userfiles/files/zapid.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093189b4027b---80221975387.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0dba646d1a03d73b871aa619d6b4064e/54123887877.pdf
    • http://magogaralbamoble.com/galeria/files/xufasosowifadad.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcb17ce65---33102279143.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4be829b2---72630720058.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=words+that+have+i+in+the+middle
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/17dd85528e7b1b8aaacf12d02fd21fef/kiwudolik.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_off0000eeac.bin
e22be7712e93ab203d7558fb76f72e966f1a05ad26f7f8df5055ef6bd651374b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 17536 bytes
font_01_sfnt_off00011cc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes
font_02_sfnt_off000134e0.bin
23446e62af32c1f212f22ca96b726a38f15bee40265f79012226ceba4b478067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 10572 bytes

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