Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b06f793cd55cd3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 01:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f744a1b6147a6383c7d62bdf5a641ac5 SHA-1: abce6e8bb511db6cbfe99884218b7199d7756e51 SHA-256: 31b06f793cd55cd3845d4096cbb6c8f732dcebad9f0f74f5c3fdd460ac19ad70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cosmopolitanhotelbg.com/uploads/wysiwyg/files/64939956273.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/91603055960.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce53e7072---rawetiniritixo.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/datewokimijuvusidekiwo.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/91368084935.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/dujigafigaxekikur.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe9404a79---20146205161.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/rozixaxuvukopi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ad6d6e66---87546767447.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/2200739704.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/letasosupenaxag.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913230542.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kakinimupepeveziro.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea6e6c8ecf---dujugazumopibixurude.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/54830228203.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/45256793783.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b0bb33fa8e22558c512816f9f6143bae/99673377648.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/xumobigojoxoderaxudoref.pdfIn PDF document text
    • http://adice-area.com/pictures/files/81959422856.pdfIn PDF document text
    • http://strap.sk/uploads/file/88853274880.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/12706112153.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421b5684a8---zebilolamojikax.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/pidavasotegafobi.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/66936234510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=avengers+infinity+war+telugu+dubbed+movie+downloadPDF 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_off0000bfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBD 11184 bytes
SHA-256: ab3d5a38cc056d1b8b951b6371462ae35ffb6691390e966fb5ff0e3cf015d8c6
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16740 bytes
SHA-256: 0250a1060c8c6409ead193303d8121c78064cefdf86cb637a91953b691fd7249
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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