Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f1f80c66554bd0…

MALICIOUS

PDF

78.7 KB Created: 2021-07-01 15:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8dfdb8d3495f7a37a151b40c95be95c SHA-1: 279fdfa8a87455c2ad1ca7bde16cef3199c2d400 SHA-256: e2f1f80c66554bd02f24466272d4235007274da1590cfb3b928e5c96a428205d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure suggests a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609861f300ef1---gisapufutuwixokijetixi.pdf In PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7e3aab9955ee93e1c277ab312de801bd/xufigoroxul.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/7vj6bl6mm17veolsj8fhduvqtt/79083336688.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8aa98ac83177a78eed2b165e2405ddd/20451885779.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0cc90d9e---biwamokaxirivumilisulodet.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/167b3703b588662101ba2525231f3de0/fekizuvavapak.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/sanos.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74299181565.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6755a6aa11dcece220a2d47a8443c20/zifudilozujasigalotuketa.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vujikapapejewopa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc658e27da5---71686607350.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff3ed9a5---65697545825.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40008861940.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/94971804050.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zetufupafibupe.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/77536751243.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/xemozosal.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4d4b76b9---linuga.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14081d20f---80924409011.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710faaa4384---77317376392.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/41d4d751974bae8f2998e5a5fa7dbf7f/71185616258.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/luwifumaxi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf2023949c---32402693428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=petechiae+after+vomiting+treatmentPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16432 bytes
SHA-256: 98d06b1a4a29ddcb83312bbd655fbce408944cba9fe5e6723fc1b125e79205aa
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10636 bytes
SHA-256: 6dac7e95a1aebfbd685fbfb73ec73e57136e1be3dd4356d6750992507b6d0b6f

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