Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcc5353afea0965…

MALICIOUS

PDF

87.7 KB Created: 2021-08-17 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b9ff7ef8dafe044a81500bd426361e7 SHA-1: 4483f9554a0bded9c1c2cd1a44f3bd4ccc798825 SHA-256: cbcc5353afea0965af2402bf08b020763d8260107e259b4a7bc5b9ab8dae01d2
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting an attempt to distribute further malware or engage in phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ruihuitax.com/files/file/37199501912.pdf In PDF document text
    • http://commune-bourre.com/userfiles/file/81915612912.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/lurovemazuk.pdfIn PDF document text
    • http://iwishop.hu/file/fokakapowotapubeluxima.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161140d536a7b8---78829731132.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/52789145669.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/fikevasukuvusodi.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/32384516159.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewezabolawixarela.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/duwotof.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f06c1a6ea---2763935959.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9a663223---kipolawuwazinizegukokamu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b81e325c5---36689282647.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/nipugazab.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183ad42fc7---popedigapasotofitugudaku.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41df9b86b5---35920922950.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc28812b7---dajanote.pdfIn PDF document text
    • https://foulardfotografando.it/file/zutidiruberewaborezejip.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qabtdvinetnpusb9po7ssq6o3s/32594763316.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/70974136500.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b0595922---91900322853.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda8eec154e---53297604488.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fd088be8f---niketuregepomelalela.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/pusavevodexibikiketojil.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/medapigugibumor.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/viletujitajotuzidanaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+some+instruments+used+to+measure+weatherPDF 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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16324 bytes
SHA-256: b62ad4e7519a973a5bc076ec9fe26fdf7160545131e6b891bc15f1782928c14e
font_01_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 10648 bytes
SHA-256: e2563be4eb15d3ab268a0dd751af78f02427ced8a6ed5c3a82ed5d4872191759

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