Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8d53b44c8b094c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 04:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4d13d523a9bf5374d6856cb2ec043cb SHA-1: 6eb4635501f4552cb9bdc9f0f2a41c8f012c0cfd SHA-256: 5a8d53b44c8b094c041813cc89e380430db7987d601f555ef717b9c260248563
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=curve+words+in+photoshop PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb774e2d87---malarafanokebitukima.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/52779814021.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b8b09558601f23bb656fd4bea924c813/17853647936.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/16000213407.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9da2a59dc---jabazaregibi.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/50279808169.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ce04d7918a02e77bdcb24be51811597c/35943253594.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/27448680117.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160710f62850b4---lorixoxebinategoxupafipi.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/gimebokoxema.pdfIn PDF document text
    • https://placute-frana-dispaco.ro/userfiles/file/sowaz.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa8c845be---donibikotexekifidejepu.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/zagemuvoximukiviru.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/51894273674.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/99150891375.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/fudazekezelubitaj.pdfIn PDF document text
    • http://gistys.com/userfiles/file/zevifepezaje.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/92124cc3d15b46a67ba39d642d747977/56845355673.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0ff9be7e5653131bc3164ce0386d935/gutasewosizodobamusubexe.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/81712876280.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/segofonagerozewizakoluvi.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/revuxifidowumugitafis.pdfIn PDF document text
    • http://szpk.hu/_user/file/40872380233.pdfIn PDF document text
    • 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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 18476 bytes
SHA-256: 2505ead51486b28503bbac36f1a72c4d03a0c69f0efd3c9e68c4f771e21a178c
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10564 bytes
SHA-256: 9d40077053fc2bab11b7b59d5577c371a10b1df4ff53b02cdda5cfb99756e2bb
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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