Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b5149a6d3cd9a…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 14:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5eddbfd759c5d11f9e91e3192b32782 SHA-1: 1cdb3807074912e19a46f9e662eefdf58e0d6edd SHA-256: 798b5149a6d3cd9af044dc68d6d09ca8a8fb79c9491abf88ee25d05d883d589e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://jarosi.hu/files/file/49419034826.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930b62d24d8---woguxavuzemaseguwakiwubut.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/11471774052.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdee958c34---pebofenurumapameg.pdfIn PDF document text
    • http://asfalon.com/__files/file/rejoda.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/zafeviwulesanofuxumof.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/03100773cbf24c3b90ad1311844e6354/28531687716.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161802117874.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/89247982694.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e04aca9b5efc9eca709837af81638b3e/3491956237.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/41009559055.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/7326367493.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1cm4ljrc24lj4mdadpe3495ovf/rapaloze.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xexeletekalolakugob.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d3f88930---lixapega.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/iu9j9ajon53go94ahq90hphcqk/47325364727.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bbbv06die2qr5822fks229sbn9/pojopulez.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f08c0cbe---sixijiwitar.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8f769a88---xumijon.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/91b910af077b10a7e994fca684269ab9/wozafarase.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/163a96f3ebe9a37d654d43aaa14301bf/39573906595.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p6sahvims61pp1t19e4dbl8ah0/soxutimisuxatisebamezaj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815541afd70---nakiverozalinos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=romeo+and+juliet+pdf+act+2PDF 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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10908 bytes
SHA-256: 63d737de693226ed82086b3e618a148ec81ab28b304883ef807f862a3f96937a
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 17044 bytes
SHA-256: afdd0bba03eca02027b32a13a62ca17ac8e926cf520b1a5e69e8d94eb79ab116
font_02_sfnt_off0001392e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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