Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ccd989c53cd08c…

MALICIOUS

PDF

93.0 KB Created: 2021-08-25 04:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 826e50982f7712380970537edc3e1fc2 SHA-1: 43d2228a7fa85475a9db780a6c50ed8c11c61aa1 SHA-256: 45ccd989c53cd08c5c0a8d08bdced7ab7d6d29c53cdc8f061a411b449e3b5b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to WordPress sites utilizing the 'super-forms' or 'formcraft' plugins, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/855bcd622da835a766d7699513d075bf/61848799937.pdf In PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0c771252206444c2305fc6d7e8133ddd/97010196510.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1n9c112juq5ijspept31083bv2/53721929143.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8291fcfd73---lamasefifebowepoz.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/juvum.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c2a30a9a576a1edfc1e15dd00bd69995/34038707576.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a6cd76d8---8133063211.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/14947894038.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060313363593.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/10888967259.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c848756cf5b882cc94a6cc369de646b2/65524681625.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/39231342239.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fewojidavejoparukebuf.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/729c9af1fbf9c336ea670162e872e697/sinikamigurubuwapabu.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/49084813837.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/47751282933.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f2d53a04fccdfc213c287e2006ff25ff/120422473.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/71016397097.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/85722316450.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799772c7e3e---romirakebugogag.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdfIn PDF document text
    • http://i-dron.cz/data/file/56195222986.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c94183b1cc9---33874139165.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/98055461993.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/86760282226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+meaning+of+brbPDF 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_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 19700 bytes
SHA-256: 692bfee440d6e9cf5c888c2555a02e3717135dfa10bda5a75d7bca12a11785cb
font_02_sfnt_off00014dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEE 10748 bytes
SHA-256: a7e86f2ebdab99b898990fa558a357c14993d3166f860732074a72eee3f36709

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