Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac73d44424dda4e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 06:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9dc2545c956ae9da6fd2dc51074c588d SHA-1: c7b4c40685ad102141076d1f236eca4de02bee9e SHA-256: 8ac73d44424dda4e4ac65bbace932f23ddcc3ce3c2832a40e3d58d792c6cf5f0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure suggests an attempt to lure users to external malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/36b229f848c484a28e966a7c2a701b7b/wimidipiwazipivemojenabo.pdf In PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/tatesefep.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbf287b32---wexejorijopowesesokedigi.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/17633533014.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0aba650cb86fa4cd6c45736e75a98960/xivinusagal.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107950e21ddf---38738017210.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70036914285.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/bitodabibuwonatematoduz.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/48407014247.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1632987d922f6cd04178cc838f83e169/25237167406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260b61f1b8---sezitakuferinotipanaze.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f1ffedc74---45400628198.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iqa1fcouh529c9dn3mv7gl6fd1/41865489554.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/55845337646.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/12333653550.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/91223351906.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/47158286495.pdfIn PDF document text
    • https://ever-progress.com/upload/files/finadatisopakop.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qp51numlu5dhij3q3tsgtg34v5/67427801796.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210717033041.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/jivofuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdfbox+get+text+fontPDF 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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 17708 bytes
SHA-256: eb630920f1136272f91ee49a706c29538911118018f53864bf1f91361b65ea34
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 10204 bytes
SHA-256: d427d6e1e963940529029e6c918cd4d32a272475c7e97f63a429d849412340d0

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