Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36b3a05dd8d2678…

MALICIOUS

PDF

88.1 KB Created: 2021-08-06 14:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26ffd569481b4b78e0541b7a614e1d56 SHA-1: 85d849597c9650a7baebb1f4c85b4658c3437ed3 SHA-256: d36b3a05dd8d267821a626fcc31765284e55c4d8dc48034aeefdeaf4fee79952
104 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and several heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the structure suggests the primary goal is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e5c01bfb958751b35ab862622271dada/54922736999.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/fogugikuma.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11400541383.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ff1b0e45---zanesedositatufepapo.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/bezizimariritu.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/74792494127.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/30510991293.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a81609118---mekafad.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021716239435738.pdfIn PDF document text
    • http://darec.sk/files/files/mezala.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3e62db44---kewozemoxujezosiku.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160835fcaa81bb---32262596478.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/57114482840.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf135e333c---ferubevugo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/360fe0c267f61de2faf72447c07bf53b/xepagiton.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/25143501536.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/wegubutifev.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/18057019464.pdfIn PDF document text
    • https://gangnampools.com/contents//files/33206632312.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/nevejunuxixanop.pdfIn PDF document text
    • https://people11people.gr/uploads/File/17485749759.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kelezozifefenujerivitor.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/subizuta.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1f30a2a2e3a26b488f33a3050faf5996/tozawitikowut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+create+an+avatar+from+a+picturePDF 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_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10668 bytes
SHA-256: b32a38c0cb025803fccfdcb4c7fed6bce83b527314e7a7bb87963755a0fce952
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 17168 bytes
SHA-256: 2f53a52254de3610e00ae197a67c87e9ee145d43c2c71d0a679990d264dff59e

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