Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e070d89794d7a80…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 01:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45f8efb800c6d5f9be9358fe389aade3 SHA-1: c19cead201f7b31bf1ce67e5cf90085f35747d7b SHA-256: 4e070d89794d7a80144a14f0e82b563d18ecf984ac62c287ba72df43f866f399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, specifically within the FormCraft plugin's file upload directory. These URLs are structured as link farms, suggesting an attempt to obscure the final destination or to distribute multiple malicious payloads. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8e50e1d9---18355809747.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/gipufizokejomotox.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/62273768680.pdfIn PDF document text
    • http://thegioioto.store/upload/files/78654562288.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fofarob.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/21301651058.pdfIn PDF document text
    • http://exima.kr/userData/board/file/56863488339.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/44734132278.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0a183b60---48652078708.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee61723ae57---96233571888.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5e9376019486db2963fe57d009852207/gigezigufam.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/35185254477.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1640da59---gurolezamov.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd1fbd5a826cb9def404ac23dd2000c5/81214389296.pdfIn PDF document text
    • https://immobilgold.com/file/baruzikolizipemesijiwug.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/32617044929.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f353ef6c4e56f64f517ba5155ca16a12/92928832382.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/nebukarifakite.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/17195674239.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cgnh2c71lgqe4akbchm5c98u6o/linebusabigomipeleda.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/52rq8bnn5ak5bako5quejrprf7/60979558672.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=semiconservative+replication+stepsPDF 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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 10676 bytes
SHA-256: ee37fde8002629c1262c722ac68274721be9fa00f2ec787913153095d0a412e6
font_01_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 16724 bytes
SHA-256: 0087e09b2fe71b6b1dbcefe370b25cd28d7572db827fffbdba2427a93b8d2df2
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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