Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ac3ea79e83921f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 08:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5bfccd0bbf591021676e97a6c1bc14b SHA-1: b3f8979ba04b7a2b6723d7c3ac3b01ccca5b7166 SHA-256: e1ac3ea79e83921f171f21a49fa4ff828285914e08ea42cc7dbaf18988f1acf6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI heuristics further supports its suspicious nature. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e1835820---lawutiwu.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1057288c8---76733139437.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/togedonusuvis.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/vuwejum.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45277389808.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3f54250a---31124371023.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d62b583b4e0---84762564189.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xotadupodobovatuxugif.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/57985916439.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9792481246---31542547660.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7284acc0a8---39181610860.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/30616470565.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c741dbb5---65733405975.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/51922415003.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082d0d21c38b---50339755819.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8f04bfdf7ac95541425d9fbc93b8dae3/pulixexagewozaroso.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bumalomu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/gobut.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ade6f36c.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4c7e523cd88d845000d02901e0ba015c/jodazak.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210806151347017699y1gf99bhpmj0.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/be817a72ce2a157d2bd8381daaed6c4a/leposorofatigiwutesami.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9032288668---wawanadexo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3efefd8c---25986653643.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/17889052562.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/27863629268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sonic+the+hedgehog+classic+2+fan+gamePDF 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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 17432 bytes
SHA-256: 70ebb7f29e1a47033f3b368968dbd064fe155813103292cd29e6e6f527a14662
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 11020 bytes
SHA-256: ffb12f132c29ced6d9e51b84298ba481c0e30d273a931f99798805e4849be040
font_02_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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