Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e5dea9655857b6…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41c9f9edcab79ec1d0a8db2cf4a3c60e SHA-1: c6651aba6ca9e8642d61dc34513c02f0be763840 SHA-256: 28e5dea9655857b652fcd938fe1437eed8c64a6ef73ef95a35ee2fa805b72993
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on compromised CMS uploads and disposable hosting. These links likely serve as a distribution point for further malicious activity, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6446a501fdb1b3f905db6a0c2f2db519/72178329753.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/39e4dbdb005dbd5296da46129f1ce741/kodepifawogom.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/lezevizaga.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oahj5e49rdf5h38mcqrm0t8su1/lutaketekapev.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609541b864c8e---bixilegejomolefelab.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/72247757218.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rorofavoxujo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/50892315468.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804d145bcdd---pibibopozuwa.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0445e5e26---wasogegijumalu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/h69uj4ttgqacibbsnpqu2v12f5/22751519414.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/afdd49cd190e412bfc24f9aa1e9a5793/nizipoxet.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fowojab.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608002d4b1594---64169798527.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/jilasugawapoxowor.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kidudo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075f63582cab---belujegaka.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074964fdc3ae---36165183557.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/58418310474.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/73996645306.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/pukokitamosatepip.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/23124816113.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e84582123a6e5ae4bf873f028f19c23b/zelodexofeledapedasumomu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/rulekufamafoxotumowuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=educational+federal+credit+unionPDF 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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 10384 bytes
SHA-256: 80acb30bed12ae717ee5cd750873fcc5c22ef04887ef66cd3de1c97300673421
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 17128 bytes
SHA-256: b152fc510b2e258c4c662c06308efef22370ee7fcaceea3f7905cee0b6e55626

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