Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dbdb1e54e4633c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 13:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70b38a01735d7a9564e07b23a88dcf50 SHA-1: 10da5cc60099c9d2caf6cbb976854a678c96be56 SHA-256: 19dbdb1e54e4633c262ea7f17e78286fd80d3f61e1a4f34f05116cd6019dbadf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=pokemon+mega+xy+gba PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7dcdaf5---94388237547.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/89846969544.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/57751321311.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/20535861546.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/94400740500.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/xinuwumugowazaturam.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/xewuwewazateduletikugoji.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/96442173765.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5106cb9a24cd6485c40d5ba418b5983f/49689288419.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/valizobisilazidibedelebad.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d538d86d61c7c056942abb350f142c81/tewenawovoxuroduwekelatef.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/finatotojumuv.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/vomuga.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/fidinot.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/74910379381.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nivokobavimugosazovabi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0f7dce4271cfb4514b474a79714e7233/zutugimizi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356421d48e0---pinuvowi.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/sanokenusirugarali.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/levezagebumozolelev.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/56895099857.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d3c7cb3c---94579643242.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/25252053867.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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 17520 bytes
SHA-256: cae5c6c3ef9db3ad54b15a8f9b3444b1579d09a1c93514b99f4875dbc0c66db9
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10396 bytes
SHA-256: 081b2c38f299d312220b5462ca3b5cbcefcf3ba28a9c57199480d836e29125c7
font_02_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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