Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30b1d32da17d1bc…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 16:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb21ad015f65c87198809120707b207d SHA-1: 2dd499019b225d1e639f29a30553c56319db4ff5 SHA-256: b30b1d32da17d1bc956dcc956981f06e91991e4ec9fab91989f8bcebda299665
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://easternresources.net/ckfinder/userfiles/files/wibefapifupiwedixiwo.pdf In PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/kisadopirexififojo.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/nijobefabugulebebobarodi.pdfIn PDF document text
    • http://master-br.ru/img/file/38637866351.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/merofejewuwakoso.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/mhel42uu154ri3r6p4klp7h2lv/69483473214.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c719967652---15561864924.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/29829481800.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/93633161290.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/563b1cda47f988754da9cc3a4f2c6461/nakafon.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/zadugeki.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/80860167765.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/24079590983.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bewojezobukagivewurivo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c0dd02c---negapawofobubawuvi.pdfIn PDF document text
    • http://innotack.com/userfiles/file/febabolunenerer.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xizogilikujenepalukudu.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zegatejabalovutoba.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/91432135206.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/3904119573.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/petopomudegegolu.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/39237005891.pdfIn PDF document text
    • https://airbays.com/userfiles/file/givakuzunafowiguva.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/82476051852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=easy+share+wifi+file+transfer+pcPDF 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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 18076 bytes
SHA-256: fdb8d40a5be70a71d879ce0704c23cc1157b2ed006d5de5592540fbf4c410e1b
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10640 bytes
SHA-256: aac91d29a6fbbe151f3695797162b465419edaacc38fcd49668f898afa21bba0

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