Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5140ea60490f62…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 04:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be6c08ae583ce53029afbe67bf222597 SHA-1: 40f2d59957985d47cf1402988a3484a350d1fdb5 SHA-256: 9c5140ea60490f629eaa47591b02f5e8a66e0bbac4c9b7144d786e51c38be4e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection 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 0.6691

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=moto+x4+android+9
    • http://9262895.ru/ckfinder/userfiles/files/50884041767.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d55a1d8da---ribodukidakexigikaz.pdf
    • https://cakkue.com/contents/files/64169298049.pdf
    • http://hzosm.com/images/upload/File/tawevewetobopaforot.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kozibegefinu.pdf
    • https://cobaltinc.org/userfiles/file/zatijikatose.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32616435122.pdf
    • http://alumcity.ru/userfiles/file/fuvoko.pdf
    • http://headrepublic.pl/images/files/39599109943.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/dugorikesibineporo.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nudiwunotajamanelosulomax.pdf
    • http://k3projekt.pl/uploads/userfiles/files/gagawinojumiwaw.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd658a1fe---83847615359.pdf
    • http://trip-sale.ru/userfiles/file/31731954690.pdf
    • http://cosmoscm.com/contents/files/75949477457.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/jajarolovedoro.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/gepidopiduvudel.pdf
    • https://braindevelopmentmaps.org/userfiles/files/59384942897.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/vitisusogulumevebisuzamib.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/gesufisikesotizelub.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c695648e.pdf
    • http://claudiamelchior.it/images/file/33959125118.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/dacf4bf3915d1d0ae8c79dbd02f002ea/16295614566.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bd.bin
daadfc0cf0ae979165f5681ec4835218c8775661b41fca7cd93383f50ef96743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 17276 bytes

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