Malicious PDF — malware analysis report

Static analysis result for SHA-256 6418ee94190f296a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 13:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 04b3cd01d0471991df0b73bb1742eeb0 SHA-1: 7fc43bfc758a91285bc2b0ab22b11b974ac24f3a SHA-256: 6418ee94190f296ae77f5a1c51e80d8da87301c36655526a58df0fa9f787fa51
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://contabil-fiscal.ro/mm/file/62821000568.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/83728860041.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/8276761566.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/33042118828.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vutolosekaled.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/wuriwilimolajututeruxap.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10bd242c9---jepikizenetupafaf.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/59986190070.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/neriseverugakigoge.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/valumoretuzozogu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/88176864219.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/35666132177.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/49079191105.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/kiwesivofodit.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/lazagukoson.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/480596228.pdfIn PDF document text
    • http://waterreducer.cn/d/files/1921994046.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110e1601e4d8---65285844500.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f596b7875f5---49085893667.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/8226112776.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160904ab5d994f---gesejotuvutipe.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/62894255300.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/26132912665.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/76b832699c7995854a4d7f293d54a375/wurudeniporuzov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2003+harley+road+king+for+salePDF 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_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 11056 bytes
SHA-256: 95227cf2788d6722583cabc3abda0eb4974aeb2edc5300742dfb3121ab1d2b4a
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 15440 bytes
SHA-256: 92e8469fb5172ad1f57227bb7540edfd71a7f8950da2342d30f84a92b5f366b2

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