Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b2904852247205…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a8e9e26020f5eba7e59006aac7442b8 SHA-1: 168932c5147fd78836ec3fe817d68b32f6b34237 SHA-256: 31b290485224720514bb6dac691edf16320c4f0e2ddbb901704c6ef10f31e8d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and a link farm suggests the primary purpose is to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4789ae74cfe9d0f7442ee53d65ddb64c/79062756542.pdf In PDF document text
    • http://fotostudiovaccari.it/userfiles/files/dakuxerofumake.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c88e264811989a8dcd8fc8b39ba63cae/tuwimemom.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kh2gdl5vresjmq1m56ee9huf4m/marijafula.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84e8b5a6b---415060862.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/24761391053.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf4134c92---40336308271.pdfIn PDF document text
    • https://avenue102.com/uploads/file/bomedevisonez.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/febujo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c900d6d4f8---sewifibujixisunoz.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210713_AB5C67D2115FFA0C.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210525041902.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bewovomufami.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b031588c---pepofe.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/ruroxuv.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160dde7a431c80---widimurunategimubidifek.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xajetinodi.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/sonudula.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/zudumakanuz.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/riguwifan.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/gidakekiw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/527dcd456e43d02b3a34fc1dc77d9186/77644865911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=diabetes+and+periodontium+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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 16944 bytes
SHA-256: 7acd4f04319ef2c5041521572df616d99fd5b00456b29ee6072e32b44798d45e
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 10852 bytes
SHA-256: 86a7888ced2492686b7a05327187696905a69b647049f24313f7722636a45f69

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