Malicious PDF — malware analysis report

Static analysis result for SHA-256 7517ba8815294f44…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 06:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18c99eb0c15827100bd0258c74c454c6 SHA-1: 617546bd17d01d203ac7ed985d16fda7fff1f8b5 SHA-256: 7517ba8815294f4498302f4093e095e5272c4bf3185923db6d4b6d798de7a13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=dubin+ekg+rapid+interpretation+pdf', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=dubin+ekg+rapid+interpretation+pdf PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3baa14a6ab---xujimifapatibifelobe.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/20472177656.pdfIn PDF document text
    • http://zatacorp.com/upload/files/42290638711.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb09613d737---2156030748.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/78183002830.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/86795908448.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/norekali.pdfIn PDF document text
    • http://henca.com/files/details/file/gefunedolukexudedador.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3c7a58c2160135e93b3f509e130f97bc/84807959859.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oriluduz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fac30330---44485215100.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d4da46f47b7399976bdafcb7c8230df/jorede.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/327d79b4e1ae4e709329324da5b4ec24/62071460042.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xodet.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad7abef43---32065535530.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d35a956---gitarefapemamoxajovi.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/vogunowulodiwojemuxawi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/61021225032.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/55c347987e342222dc31371f15d5941e/58475623492.pdfIn PDF document text
    • http://stattus.com/assets/file/11222603632.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/lojafadikowuj.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/neferopusizibi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/sewajuvugoduxutekatojowet.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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 17368 bytes
SHA-256: 1a58e7a46bd182b4afe97d820f71c96b2e4de4886192e5a5af6e9d7494d4a5be
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 10792 bytes
SHA-256: c1868e9593af35215db4368072d2eb0e4753d49c545dd775c6d16ee7abe0eb41
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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