Malicious PDF — malware analysis report

Static analysis result for SHA-256 e896a26777cd7e07…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 05:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37c2af070105828a84dad9de203c99ad SHA-1: 87b19ceef6971789d02ebd5f4ecb4317b10585a9 SHA-256: e896a26777cd7e078f9d4eedee595c14b51152b9a123e88cf94c399a255814fb
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lead users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=magnanimous+in+tagalog PDF link annotation
    • http://karunb.com/UpLoads/files/58090310073.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2022512467efcb563ec86a71f087ec7d/17760958616.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kulapewotut.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108211145384232.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41accc56ce---fozosojusafanajebul.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/84820824352.pdfIn PDF document text
    • http://ozari-ua.com/files/file/34744131311.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/65868872172.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210808_37079B0323C734FA.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/sugib.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/delupaf.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/19367709264.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4e8fd6m2ap619v1rc4qkemae09/jaxulanimoba.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d39pbj7uibl3289slr3vsvrje5/81149296569.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/466d185029b03b5f7e796ad906572f59/gatasoroxenigilere.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/liraroxepisovulezojabop.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/54pgqf4n908rr222ok2ne1fvvb/10341360883.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210619012555.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zazedago.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4050a5226dc5e3323035b3dcab20dd83/78407415185.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/vimelovipamunazuzakike.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca40bc6312f---43343997811.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/wusiwasafenaponi.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/39914216304.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/55556d7d1dde4e66cbbd737f2d88c646/soxubarewatibegek.pdfIn PDF document text
    • 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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 10312 bytes
SHA-256: 0f49437257bc5f89615a1be8332c89751b0d5c6a55d7bad9dd7abe5f64e2f4a9
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 19884 bytes
SHA-256: 03c570c6cac08f2112facc5ac2e617d22c8fa5ea72b744e100044475960a2bc9

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