Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce165bc3a47d608…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 13:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8d4fd9de4c46a7657b3b606464b7535 SHA-1: 65d65cf21ad91d87cc216a99ac716b7d454b38bf SHA-256: 2ce165bc3a47d60843a0a2e05c8533ab1e279ce916c7f919bac80565c43ab5ac
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ismet.com.br/ckfinder/userfiles/files/tumuvotevagugobosupu.pdf In PDF document text
    • https://hirurgija.me/files/15461464196.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329b54c710d---81668482312.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/1095846955.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906203154.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/fivosaluroxi.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/46202395634.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/78015761622.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/21023596622.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/tozajukibotukijexabovig.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/defuvezurubamud.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161354003c25a6---wivisuwavinedozoni.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/vikosow.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/74842461807.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dc228831---mavewakonibojelav.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/nuxopanavuwuwomivexukalu.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bekoxa.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/65363232415.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/xatipi.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/66529074642.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wunekonufom.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/vezifavirud.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/84795319264.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/14612929197.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/99d85a1949b07b2e84b6d55f788a206c/40483127580.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57133343709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+quest+9+emulatorPDF link annotation
    • 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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 17476 bytes
SHA-256: 9d822f0c5975e8d7ddd2ee7d8afe15a5f238cab2bda095c889d0c63f739166bc
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10776 bytes
SHA-256: 95d626e4e2756afc2ba4429caab33c1cdd2f0bc3025e8e9e8f2c1c3c5f4e3912