Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bddd3e4396a79f7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 21:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1061b4f8cd97c38be3d6d7ce2fb7f5e1 SHA-1: a3126b0efdb942c6d3689fbe7f77d49d9aaa3bbc SHA-256: 7bddd3e4396a79f7662cf6e60d99be5c91cb078a137b4444292fc357a7130215
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=android+save+file+to+app+folder PDF link annotation
    • http://cuspsurgeons.com/userfiles/file/22111916674.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/rugowu.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/durubudaribisopaxupakigow.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///68219579111.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3a1a110753c55e44e5c676cf76d546c7/25321323517.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/zilesorepijisumumoxorudak.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/67150317091.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/28483055787.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/wogazajidunomedefijore.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/25839338198.pdfIn PDF document text
    • http://hidropro.hu/upload/fanopeneroponegobenalex.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/6764528682.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xizunepoxataval.pdfIn PDF document text
    • http://uhorder.com/upload/files/tokolamonapukugakalujomu.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/52170060499.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/78814991421.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/60049640502.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/bedovajawuvufuxi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ccca13ba---11313469370.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423284a6ff4---31955883866.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/xepigopeniwidikodigofijew.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/71165477584.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132614fda3d7---kozadanowubu.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86344401826.pdfIn PDF document text
    • http://erpos.sk/data/files/bikodepilizuxavepuxena.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/9904412208.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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 10540 bytes
SHA-256: d7d3b80727d5c524aa9ec777bfeb3e2d25083ff7d3144bb1e0999a578c7ac3a6
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 18848 bytes
SHA-256: 2b93aaa675dc9f5869714869f981691f4e237b7cfb6b63b77e9369dd1c03ce8b
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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