Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a59c567ba48d773…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 19:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b21c26d7496727762a1299aba13b2d9 SHA-1: 4edf0496668836c91868c2311c46a4092bf9e8d3 SHA-256: 5a59c567ba48d77330e180a39e55bf5f4438d9c17dac393115cf3402c5ce1ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=responsabilidad+social+empresarial+en+mexico+pdf PDF link annotation
    • https://samowar.ch/upload/file/ketiw.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/34206026176.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jinazutaw.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/4118464648.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/31965167139.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/dilavalotamagof.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fca4e39e---32607308243.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd17c9ad3---rizovexubofofogosarako.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/buxoxosafaroxipolenoki.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2aj88uj8h5qb05n50gurjeei50/jomesad.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091d006cd648---jikivujunukubif.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20575cfb94---57402533671.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/naloferukavuru.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/23282738174.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ovrudrdup3lfphi8kkmfq6umdi/35277703687.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf6e2194d---8321923938.pdfIn PDF document text
    • http://timapools.com/uploads/files/kuvowipefoki.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/93985212002.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/16328814304.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63315289427.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/59570798515.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/ponevopofinat.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51183373250.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/wevipu.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_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 19020 bytes
SHA-256: 3bb87302562d78e836b26f7101ef7c9996b114c5b7b9315c82ef4cb2452a0ca4
font_02_sfnt_off000135dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 10972 bytes
SHA-256: 28c1df9dd06a5118bdce48e0505fc6d2c4063669de2f12108178e0ce542cde91

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