Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec1237793bbdd13…

MALICIOUS

PDF

70.4 KB Created: 2021-09-20 05:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c84e8b53b647ba15494841addd06aabe SHA-1: b2a400028c1a5c6c2ee05d96a8b22773063c827c SHA-256: eec1237793bbdd13d0c1929e27994e9d248680f27ba1fe42eacff3574aa43e91
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of external URIs and link farm heuristics strongly indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=cara+convert+pdf+ke+powerpoint+offline PDF link annotation
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/debudano.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/zosijuzidunapufom.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gisakoditavefisivobuteg.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/46568456927.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140159728135---danupiwun.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/25830094861.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/bavipizamalajawuritu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/wezapugu.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/femelile.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/25094893024.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/74354461091.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/xegalekafabakonosuguja.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ee270c635ae70c192391b74acc36f0f/96089191511.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5b0f6bcd1f79b35884de0c61b2a85fe8/52133663105.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/foteput.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ad0cdee0c3396867f9ada9662a14e6d/98049310801.pdfIn PDF document text
    • http://cy2hand.com/userfiles/vixikofeleripilov.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/dumeliromoxinexazop.pdfIn PDF document text
    • http://htwy.com/upload/file/zekapajerotepapavofa.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/tisagomogakukak.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/solaguvufagip.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04e65842f---69166417842.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910131658.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/91640556861348a2e4d9b8.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/lulexak.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/rowubulusotusot.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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 15012 bytes
SHA-256: 62ba4e6d1b64b9d4709894f631fcb4136d950f4c84d09f50c06be8e65a15a6f5
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 10720 bytes
SHA-256: 31ce0d659353023a271beb7b722a5a3f13258fce865303f4c349ae8d881208ff

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