Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a6ec34cc016a5…

MALICIOUS

PDF

71.4 KB Created: 2021-10-06 18:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bef1a740809af1a75f00ed33528e63e3 SHA-1: ddea861e8791927bb865c252da12d0e2b8762999 SHA-256: 564a6ec34cc016a513e505e1208cec363110b76d6c8b577d91de7609efc92572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=pdf+to+word+online+ocr PDF link annotation
    • https://www.l-games.jp/js/ckfinder/userfiles/files/likanutomozoj.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fcfd02ed8---15915425958.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/rolulodu.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/88250942790.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/58512325928.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/gexoratulogodu.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/59419123040.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/14610406927.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/ranazuvuxigoboxitotaz.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xewelabimijofetugufakid.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/17556119250.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/10830730819.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/81940937556.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/57143376974.pdfIn PDF document text
    • http://techmechengineers.com/uploads/86811230228.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dorepe.pdfIn PDF document text
    • https://edgecs.com/documents/94108142357.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/69282606132.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gnccl7m7ti9136a48f67iv7ral/23069064125.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec0213c1---tegigibegugimixuzopuf.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/popoxedezoxatit.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gixodumokosido.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5104ffab6188f5179e5f73565f6e5dbf/3800759617.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nalenawixo.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_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 10228 bytes
SHA-256: c680f0fea16160d19e40ace1e203c25bce1afbed4a7c2b2d346383d7d268b796
font_01_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 15860 bytes
SHA-256: 544d8ab11170332563e65fae04d144cc11227a96133d0222cb44184d7912d962
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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