Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eeccec6469cd7e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae6b0dd14713cee9613fa1515b5570fe SHA-1: fb65f0d8fb31ee0655c0e49c3b70e4e686075461 SHA-256: 27eeccec6469cd7ef2797fd22a0d5bdc991af55a2f2b93475401591e4772d1d1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=relieving+certificate+pdf PDF link annotation
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607456e0af3de---572702210.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99586309014.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/tudixogetesij.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/75489572102.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/gofoku.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607877aa54b21---nizulidapomasenorilomejek.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe268530f6---3597464449.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/79845459906.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/vabelurinaf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fac78660---muvavupujarawira.pdfIn PDF document text
    • https://ms01bet.com/contents//files/bivuwobibavom.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/bimuxefovaduzuxovaxiterem.pdfIn PDF document text
    • http://veribase.com/E/file/64933049846.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vl7mov7h5tnf0d7ads88968mno/48309759186.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ade283d57a---50216364751.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/83926344729.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/84679692171.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126a732b1b12---kirexid.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630618208.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/nupopevonajotifudo.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/zowaginamilikijij.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/duvipafemekipejelunesusi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/zujoza.pdfIn PDF document text
    • https://fasleh.net/Files/files/vexivejuwowowabozafe.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/91414515632.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 10620 bytes
SHA-256: e82aad78b610cdd41b293e9c14d09051d6588409f833fea8aa40023eaa74dd8c
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 17272 bytes
SHA-256: 3c6780a93de36dec179c1efaf66b565d424900836e5487a94783b6401f808adc