Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bdf16b05a14489…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 17:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85cdaa29f587d5c91e63fc29e03b0078 SHA-1: ce8eb80be2d4358b48ad97d1a7e5a825f9a9805c SHA-256: 27bdf16b05a14489be11028c7c64dc90fa1e971aa6498df3b0c1dcc19923c9b9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users through multiple compromised domains, including WordPress sites, to obscure the ultimate destination. The presence of numerous unknown URLs suggests a broad distribution attempt, likely to lure victims into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://petgears.com/app/webroot/files/file/namatogejobipasiziwuzikow.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/892aa87cd85fa56bca4e0380fa291f89/33166431622.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/98188616298.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/13636709601.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211707702393.pdfIn PDF document text
    • https://kawanmto.org/contents//files/jekibunek.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cfaab0fef---67584561072.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/zobeta.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b741b07e---jonotawovaniz.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xijawanaximibaru.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/47386506335.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vjn50l781l14od622h14ukejs4/68675247554.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab39a6984---30476496132.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6o6hs9vequsdlr2b720tvmhbq3/69704771598.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a9147ace---61968255416.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nazijeledupi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f411b86e---nefuvovonibunanodoloburo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90b429f9d---85921529471.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/76442608670.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f433278d7---84511756265.pdfIn PDF document text
    • http://fkhd.cz/data/img/nilijopabupotaredunolewe.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/05a7c8531f14e55bf5def4a2771810dc/55180158368.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/44728688240.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210508155454_1375229412.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/lusegijajoxufeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=inteligencia+artificial+monografias+pdfPDF 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 19532 bytes
SHA-256: e04d655672c41feb3cadf67dba9fe9115c2d9a1211e3bda949057eb6e1642264
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10916 bytes
SHA-256: a0d0fc8dd2eab505bbb98289a46def7af1d25f1d9e227ed420999540b3d9592e