Malicious PDF — malware analysis report

Static analysis result for SHA-256 905eaa1702c3a406…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ddb02f6440867d97479accca41973ff SHA-1: ad4a64fd87e18167aacdec562e6475347cf4ea10 SHA-256: 905eaa1702c3a406d4b7d80e22750b1e023dda4b9ec90bc7f8da296d465c3e5c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://s-h.cc/uploads/files/202109061435508964.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/wakeb.pdf
    • http://salkim.com/userfiles/file/xenew.pdf
    • https://alkathirilaw.com/userfiles/files/werenidodamatumiwovokeva.pdf
    • https://bursakaynak.net/userfiles/file/vineb.pdf
    • https://aakritidigitals.com/userfiles/files/43925439982.pdf
    • http://jandenzobv.com/image_uploads/file/67752967293.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/gakedul.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/85525276250.pdf
    • http://svazekobciorlice.cz/userfiles/file/33025051179.pdf
    • http://mrybalko.ru/files/ximenovoxeruw.pdf
    • http://pcccmiennam.com/media/ftp/file/67032134398.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7f3a1ddf---nivedagameg.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/98428740608.pdf
    • http://www.centralperdana.com/file/18929365043.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f5c6c628---94988851265.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/pigiluwekiwi.pdf
    • https://ksdc.in/userfiles/file/fodubigazaxegel.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161456cbea4631---tebodelufojofasu.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/nefixogogeg.pdf
    • https://matricula.netlandschool.cl/files/kuvip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=night+sky+wallpaper+4k+android
    • 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_off0000c98c.bin
f457cb1bc876ba1b96afaa0398b75d4c9e3022fd59d2fed89ab3cd77c3e1f28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 11020 bytes
font_01_sfnt_off0000e308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16792 bytes
font_02_sfnt_off0000fb1a.bin
737f79523dc95717a799a43a56fe9b74cb1010a815880da93ec773af8fbcee05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 18960 bytes

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