Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c20afd42c0ee0d5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 13:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c00babe6dc48695cac740a50493786f SHA-1: 340de532ae330657c7da5a5f5a0c4e1b849ed39c SHA-256: 8c20afd42c0ee0d5cfe916fcc937d7ca85ca332d018e6b0da3fb8a004d1712fc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, including a WordPress upload storage. The presence of these links suggests the document is intended to redirect users to potentially malicious content, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://tl-systems.hu/files/files/gemusu.pdf In PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/piriwilizisos.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/65381096942.pdfIn PDF document text
    • http://deltools.com/userfiles/file/vaban.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/dawuzuketopobowokolixok.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c2ca98eff4a457aac2a6f1494f75d6f/69094811674.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1a72bef8c3a8d055fb28c8b656bfb116/31169689000.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/13792398095.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42a0f135a10a1d913a84aabfac9bddda/62371069915.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137868a65ae2---79351016473.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/mununofamezabijapes.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/39266083996.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/9134934416.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c6cf6dea9018e40a3aa97be8468b6814/siwomevavimadev.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/39895354278.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144360346709---65540869650.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/romusexifixatogekodewo.pdfIn PDF document text
    • http://djapm.com/userfiles/file/34969264463.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/suwisasesejix.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/fuvimul.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/jifigat.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/sowulemif.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///66259291678.pdfIn PDF document text
    • http://slsnn.ru/content/files/28862441897.pdfIn PDF document text
    • http://debten.net/UserFiles/File/86741316522.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/badelonutazerakuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+download+message+alert+tone+for+androidPDF 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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 10760 bytes
SHA-256: 31049dcc3e8bf8b8e384f2b8854f5b3faf5d26e2d90734b25c00c40b0ba1cc7e
font_02_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 16552 bytes
SHA-256: 66b6f8e8d9ad89b87d507c5bff53b526ea191735392c55956bd2253b38b25ffe

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