Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb47deb2b2832e4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 01:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38daf907321dad7ae0d2ce7d28a9ef4c SHA-1: cc4f53f5fa583fbf67c67e0987f27dae4cbc61c0 SHA-256: fdb47deb2b2832e4e907771b6dc9b7a89ac37df125ddf143cc7165e00d31f60c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t66tk5lct5otkqj71ms3ngola2/37403342961.pdf In PDF document text
    • http://campingwithconvenience.com/files/files/xiduwedekarimutosiribafe.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/75170709426.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gitoguzuw.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/34921434030.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/426a20701833ea14c9e5bb6e3a66d9ae/mogutadopewalipofi.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/ragidimutazalexijexo.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/81181628112.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tinevugewi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c633aea8ff---28662251328.pdfPDF link annotation
    • http://kimsanghun.com/upload/userfiles/file/202198159149774.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/ropetewipogeguxixa.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/51599825986.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/dutuvut.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/59065780879.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/luvirexaxup.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/54044196333.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210908_CA3AB184784BD0D3.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75745218537.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/lozigaboxasox.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/movomofilamixo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xotatubutujagodezaba.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131739f1569c---32854221866.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb052e2bc9---xevijubopixakifefe.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/20026099103.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/28910897754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apkparadise+nba+2k14PDF 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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 10584 bytes
SHA-256: f77a67718cafd50bdb1126322205b73a6fcbcd6a27d68fdc869f87fa8c1ca62e
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 17668 bytes
SHA-256: 3e30d833c80e44fdba74e03b8572400aff320599af60610099c7cfa6025bb9d3
font_02_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1