Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2b1370c1cedc3a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 08:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72b0f2132d1f8be9585c48a07ef57ca1 SHA-1: 1b10e309e0a1e33041cf455f61e692019666ec6f SHA-256: 3d2b1370c1cedc3ac9ebf7d532aab28bbf9d4e5ad52341582e4a7ab5a2c4953c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for SEO poisoning or to host malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e4d6b09e3f228a343f7a36b065b552f8/18959735330.pdf In PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/58063400007.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/dcf0163e69075254408183415ae1424c/24141688486.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e3c8a1e1---zaterenejemikeli.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/27sismr08sfloma5er7lptoca5/zitawazozimudubiruvedupa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082d94d9f9da---nejoreke.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/34125084937.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/44062300967.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/duputalejifaneveboketu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/7505371985.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/xitiwanazizofa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ab27d3e5e---ferafirunodifup.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/zadowobofolagetorun.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210613231657.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdbc43235---boxolofututesuvi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/koreparevada.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6177c03c---90731802365.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xisisifilik.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608b6fc672a90---vosibabesoponomeluviw.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/konetutimuzunotedo.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-05/images/files/50948901085.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3e70eb8a---jifij.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c907ec2669c---99162371841.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/19770511169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hepatitis+a+pdf+espa%C3%B1olPDF 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_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 10484 bytes
SHA-256: 4a36e3eb30ba41cfe4a1b77a452ff5326eb48c37c5b335a8cc2b112660ef9586
font_02_sfnt_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 15020 bytes
SHA-256: fc96d31e6004dd4fa7cc16b504acff65ade181e5fc74bbfd7e866c4ff36824a7

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