Malicious PDF — malware analysis report

Static analysis result for SHA-256 d506020f70c7dd58…

MALICIOUS

PDF

63.4 KB Created: 2021-09-23 03:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbe9d19e36854d3b28ae25f5d3593498 SHA-1: 51783ff3d104674489262613efee9d0dca3c73ea SHA-256: d506020f70c7dd58322e26da7369b5445881c8c1069a13c58e5d97e6f71f6d93
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final destination. The presence of these links points towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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 http://sanalights.com/admin/admin/uploadfiles/file/vizupojasulamapivexabid.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3cf17407b7742cbbf583b0d84028c219/wagifulimumozopuxazezogu.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/50057830640.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614322422073a---wiloberujupiwubi.pdf
    • http://commandhousecreations.com/uploads/files/86284111189.pdf
    • http://schodylux.pl/userfiles/file/53976194035.pdf
    • https://oxfordjsr.com/userfiles/file/zikemewus.pdf
    • https://b2b-intelligence.it/uploads/file/96674105141.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/99862846701.pdf
    • https://ceccargiurgiu.ro/userfiles/file/55921325663.pdf
    • https://syteq-pro.com/userfiles/file/25958871308.pdf
    • https://fasaac.org/temp/files/mufabinusuxedubuz.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/jiratepas.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edadeeb777---21324320506.pdf
    • https://airin.lv/images/userfiles/file/budewewemaga.pdf
    • https://nmcs.ca/userfiles/files/xiwabomuvil.pdf
    • http://lezeckastenakosice.sk/upload/files/gofejow.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/96929558005.pdf
    • http://abwgulfport.com/uploads/files/vexadezobewobibopaditeto.pdf
    • https://irrisyst.eu/files/file/lujuvalome.pdf
    • http://tcihk.com/userfiles/97897851602.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/951fe95d7c621e36aac3ff8de6cd8632/suwozubunasitasevedubepeb.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/fowomeduzepowusig.pdf
    • https://komunalno-vrgorac.hr/files/7573941314.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+install+texture+packs+minecraft+pe+ios
    • 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_off0000d8ff.bin
cde82a047eab27fe63de7573bc850f39b9ad681a0a4cfa46e38c48feb204f613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 11012 bytes

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