Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68ae08c21aaff4c…

MALICIOUS

PDF

123.7 KB Created: 2021-07-08 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f011e7f82ad8599be307264dcacb9b3b SHA-1: df73b9187718cdf3642ea7e27c0dc5391e514890 SHA-256: a68ae08c21aaff4c717e3e8d6c3319f9d6abac13d0fc9c3c41953668f278701d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783ec1554e---60666706191.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fifidizadepoxubawav.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/23b35a281b64f4263768454c7ac9c494/86273149491.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae69c8e91---wofil.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33e9a993c---zeritolakufidogelazo.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rkq0jcqagjio6aqmuva972j8k6/96789505538.pdf
    • https://houstoncoinshow.org/FCKeditor/file/88254644768.pdf
    • http://caratow.nl/userfiles/file/warorubonojojo.pdf
    • http://chinajnbt.com/images/upload/File/gosedaravowo.pdf
    • https://parvazyab.com/basefile/api203/files/wosukuwupozupesix.pdf
    • http://ipsgroupjjn.org/userfiles/file/3016628902.pdf
    • http://macabrey-luthier.fr/data/Files/zezumebemom.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/02950bd2dadfb3a81bd13748af21e921/sesujodetadedefagobo.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0d3001cb---14539735324.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a501c20fead---13996223139.pdf
    • http://gdlianyu.com/uploadfiles/file/junevowipupalupugoxe.pdf
    • https://advik.net/userfiles/file/vexovudemidutaxexapozal.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7b26aed6c546202388046ff661cb99c4/85637350927.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073110a1afee---gexoxomaripuz.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d50063256---luzubasubob.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c037d0c764b---sabuzinugorosorinovu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=st+barnabas+acc+breast+center
    • 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_off000184bb.bin
0ab6f027c29ff19ae200bc55d19d1d9d1845b26b5a2bf2cb5cfb1e380af58952
pdf-font-stream PDF embedded font (sfnt) at offset 0x184BB 10180 bytes
font_01_sfnt_off00019ba9.bin
6ffd36d5f4087d66c236a6bc9a4cad21a1c991874b1658b1b0159a315a36b7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x19BA9 17660 bytes
font_02_sfnt_off0001c948.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C948 16792 bytes