Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec70c434b5113cbc…

MALICIOUS

PDF

78.3 KB Created: 2021-06-20 18:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b4b37b2025bb4e5e87689957141c1d3 SHA-1: a058286d1b82ee2d24a5dd41a97af52131ca89a7 SHA-256: ec70c434b5113cbccbc430e4e4bfbc898a602b8066b93dbc6438cc9890e394b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, presenting a lure to download a comic book. It contains numerous URLs pointing to compromised websites, likely intended to host or redirect to malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=descargar+comic+hellboy+pdf+espa%25C3%25B1ol PDF link annotation
    • http://coffee33.ru/archive/file/kebotozoxar.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/mudifegutis.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea50361dc9---13165797813.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab236a60cba---54323881115.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xapajubikulaxuvi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7c2a699e---69930418573.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/73076066552.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51b45172e---zijefekurelanuvedeti.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/tuxekuwelo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5143c199---46469401686.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/dvq5e36vma59htk6pmq4peqdg2/13636102994.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3dc394047f9675620da439c30d33fbac/49224060315.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdbe601a2---pujurojupituzewaworo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e940621063---sopipijajaxutivubaxa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0705a1bd9161a83e228092ac0dbba417/dezojawelefokamodora.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lakewabade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 6024 bytes
SHA-256: 533bde29fd395e90532e7b478d93663d5edf17939b08c184a962bdc8342004ea
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 13652 bytes
SHA-256: e65bd82304423338ab2121e32efb44842677407fcdba855f58c56341469b9902