Malicious PDF — malware analysis report

Static analysis result for SHA-256 e274f13053c21f7c…

MALICIOUS

PDF

80.6 KB Created: 2021-06-25 12:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0403c1bf2966f5460c8c8127c4830900 SHA-1: dd945f056ab64ad4200d8c3aae6f9161986994a9 SHA-256: e274f13053c21f7c5d541e76084d69d207a971d36705ff6dc9cfebd463f18315
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/chshugnaiiav926oc11a46kmog/xutageroxogu.pdf
    • http://orderleesushi.com/uploads/files/fejikiboteminabixemad.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb811fac085---befotov.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51ab2e012---28715923010.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc71a760f8---bikadipojare.pdf
    • https://guclupin.com/calisma2/files/uploads/rezeduji.pdf
    • https://aravlicraft.com/cmsCart//upload/file/49896704965.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6db8921c---motajefuwa.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53cd41548e---82622656546.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/92826614365.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47965909a0---novaja.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dpn89vg3dkcoj4md32idej0pj9/benimuzifugebuvuvu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r2begvhno36d366jb5f6t8in43/73764655564.pdf
    • http://africa-emergence2019.com/userfiles/file/bukegiposun.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/42533495454.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e56615e9a2ccdb967b7aa920a5e9e124/xalejisazufewedarar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=regency+i2400+manual
    • 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_off0000d624.bin
7cf9384570b8d649f2cbceb30fb0afeb289c45ad2fa9e593511dbd3aee08ebe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 17432 bytes
font_01_sfnt_off00010402.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 16792 bytes
font_02_sfnt_off00011c19.bin
ce64d8881ca116e8e07b077e32eaa162841ed49d9b3a022cf3083f25e47edc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 10668 bytes

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