Malicious PDF — malware analysis report

Static analysis result for SHA-256 187c4d7055bb6813…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85a87a04477be952f55101b637e40442 SHA-1: 89b99d6f357dcd29d2dba8bfc20600e4287c9a85 SHA-256: 187c4d7055bb681399dcebff551cc1000835f80857fd8a48f64b4e8abede44e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple compromised websites, identified by heuristics such as 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary function appears to be redirecting users to potentially malicious content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://reanda.com/jingkelun/userfiles/files/20210626001253.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nujoriromilupurojure.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cf77fe074819a3ce2ea4211bc4725768/diganujukapudi.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/1763550494.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9db6ccdf54d683b5112af882a40b401d/voros.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af2d3a29487---56202460065.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ugbfse29ucf4i0d5ee35a2m8g8/58248042744.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/26140549748.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/45294968197.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19827270---54581236251.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/zafamovurixakiw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3376eed3---60140227257.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74b71c7a3---badogamalirobatage.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/muzezaweropotagisevideb.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ab283c27---gapugasivep.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c383813685b16fcc5c7421a8d275a2db/59530230917.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210831144702.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/pejuvafes.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dij2pfolg79jiq8n2heap9oi39/gasupawulubowez.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/61934459713.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ditonasiwoxirusavobidi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/ralelifupifojogogubov.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161721296748.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jemawuxi.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/53417326856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ardeche+tourisme+pdfPDF 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_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10656 bytes
SHA-256: febd9563cb456d70880747beb5f902e56457a46772501db2a4e825c3ea535993
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 19444 bytes
SHA-256: 3f39399544f43478dbbae5fc1fda37c5ccc6662dda6018956a64edc830b58470
font_02_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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