Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c86c508b8dd8e0b…

MALICIOUS

PDF

99.5 KB Created: 2021-08-13 02:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d98b033a5c3d07f28053d808e1134e7f SHA-1: fe5826394ea3d9622bbf12552a6feebaca43af07 SHA-256: 2c86c508b8dd8e0b4cbdc60a40b190661c22713fb118a78910ecfd0a2a3321e3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://asbufestival.com/uploads/FCK_files/file/mozisazejimaja.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b869d1d82---29801690068.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8c6d5d6e77a4ed8abf020a27d2bb13e9/37456301010.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/joninolasawidigutozoveru.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///famewefavipawuw.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2095trcclmnc9tqvnflhhv58lo/53408024439.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/timoninak.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kimafaputepurelubuxafu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3751ad8ea9---zotuvatawirotudujagajuj.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/koropipowirisasulo.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/filunivokanukokis.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/serepolilodusa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f152a796---kezitivi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df0920cbc---99721223231.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/morexunor.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/28194484401.pdfIn PDF document text
    • http://cmtsport.com/pliki/nebukegudomixojun.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbd2ee149---97936549730.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/96168492920.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/57959703846.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/siparivaxikusasedijokixex.pdfIn PDF document text
    • http://bronia.org/userfiles/file/wugutalinepovako.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbe21d5dba2a67c1855916554fab9289/kezaf.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/58kmk4s5qe51vq1lrcqahaetnq/risozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ghazwa+e+badar+full+history+in+urdu+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 19136 bytes
SHA-256: e6de577d07a0bbd936ba3642da2069d39fe36db5fbd9f6dea7432f4a90f274e0
font_01_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB2 2512 bytes
SHA-256: 9aec41003625894ef2c1b86717ddfff1d4eeac40f3f6c98bc01cde29673addff
font_03_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 11132 bytes
SHA-256: 1c62a6234a90d3ba52543b41ad7879641a0ba2a5c3a0bd47edfeefe3a6ec229c
font_04_sfnt_off00015f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F15 18424 bytes
SHA-256: 5258b7977a13d2ce3b3845ed88fe2777c19e21182e57e74a1e924ba6009aed51

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