Malicious PDF — malware analysis report

Static analysis result for SHA-256 4add60bea55d477e…

MALICIOUS

PDF

84.2 KB Created: 2021-08-24 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aadeeeba5314d52337b4a3eb350dd8a4 SHA-1: 51c42448fe10ac42a43318900a88eeaecd998bcf SHA-256: 4add60bea55d477ef6d60bb0f763cef1490d201734a98579faaa4c153663a77c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://balajitutorial.com/admin/userfiles/file/27705999097.pdf In PDF document text
    • http://spamsmsgiare.com/media/ftp/file/25365626491.pdfIn PDF document text
    • https://seerupit.dk/assens/file/8552793385.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/083932112bd671e44b6e58ecf8846152/ferot.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/891fd4021399ab667f3ec165deef8607/68132344755.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/33869189308.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074689093662---mopumusakujufuxoliwivo.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/toroxepuzot.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mipom.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/jededa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16266419941994382037.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56414808716.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4c7df5f8---27979291028.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611089448aa6f---93265269172.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/51478257374.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/13722717598.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094587f1860f---gupusefuxoxuditu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bc9237040---bulek.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/17622933350.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/wadeleludukofavefi.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/popagogilebasojuvu.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/32308734470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=insufficient+oxygen+to+the+brainPDF 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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 10976 bytes
SHA-256: 2ca6e95d6b66c65134678baddd048aa0c82dbfb70ea5c2e1bddf20866df7aaa5
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 17072 bytes
SHA-256: 054fee2dc561e22236d39f554e8a3d06905f391e8f68a6d6f3273ea90f3bdb4d
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1